The result has prompted significant scrutiny regarding the tactical approach of head coach Wouter Vrancken. Despite the scale of the loss, the Belgian manager maintained that his side’s downfall was primarily due to individual mistakes rather than flaws in his system.

Hearts found themselves two goals behind within the opening ten minutes of the match. By the 40th minute, the deficit had widened to four, and a fifth goal was conceded just before the half-time whistle, effectively ending the contest as a competitive fixture.

Speaking to BBC Sport Scotland after the match, Vrancken pointed to specific moments that derailed his team’s performance. He highlighted the opening set-pieces as critical errors that allowed Celtic to gain early control and momentum throughout the game.

Vrancken stated, "We made a few individual mistakes. Two set-plays killed our game at the start. All of their goals were individual mistakes and then it's difficult to win a game." He insisted that his players must learn from these lapses.

The manager urged his squad to move past the result quickly, noting that the team has another fixture approaching. He expressed concern that players might begin to doubt their own qualities following such a comprehensive defeat against a major rival.

The performance has drawn criticism from pundits and former players. Former Hearts midfielder Andy Halliday questioned whether Vrancken would alter his approach if given the chance to replay the match, suggesting the manager remained committed to his original plan.

Halliday remarked, "There was no accountability. He was talking about players' errors, rather than his own errors, which were pretty glaring for me." He suggested that Vrancken’s refusal to adapt his tactics was a significant concern for the club.

Former Scotland striker Kris Boyd was similarly critical of the defensive setup employed by Hearts. He expressed surprise that the visitors continued to play an open, man-for-man style against a team as potent as Celtic, even in the closing stages.

Boyd noted, "I've never seen defending like that in all my life. Hearts are still trying to go toe-to-toe with Celtic on 89 minutes. You've got to pay respect to Celtic. If you go man-for-man, they will demolish you."

The defeat echoes earlier struggles for Vrancken’s side during the qualification stages of European competition. Heavy losses against Sturm Graz and Benfica earlier this season also highlighted the risks associated with his preferred, attack-minded style of play.

Despite the criticism, Vrancken’s tactical philosophy has been the foundation for a productive run of form. Before this setback, the team had enjoyed a sequence of 13 matches with only one defeat, showcasing the offensive potential of his system.

Former Tynecastle defender Ryan McGowan observed that many players appeared to struggle with the intensity of the match. He suggested that the instructions provided by the coaching staff were not effectively implemented by the players on the pitch.

The absence of key personnel, including Halkett, Spittal, and Renaud, has been cited by some observers as a contributing factor to the defensive instability. These absences have left the squad thin in areas where experience is required against top-tier opposition.

Celtic’s clinical performance saw them record ten efforts on target, resulting in seven goals. The home side exploited gaps in the Hearts defence, particularly from set-piece situations, which Halliday noted were a predictable part of Celtic’s attacking strategy.

Vrancken remains focused on the mental resilience of his squad. He emphasized that the focus must shift immediately to the next challenge, stating that the errors made on Sunday must be addressed and left behind by the start of the week.

The result serves as a significant blow to Hearts' aspirations this season. Having been in contention for the title as recently as last May, the club now faces questions about its consistency and ability to compete with the league's strongest sides.

Supporters have expressed a range of views regarding the manager's future and tactical flexibility. While some acknowledge the impact of individual errors, others argue that a more pragmatic approach is necessary when facing superior opposition away from home.

Vrancken has maintained that he will not "kill" his players for their performance. He believes that maintaining confidence is essential for the team to recover and continue their campaign, despite the disappointment of the heavy scoreline at Celtic Park.

As the club prepares for its next fixture, the pressure will be on Vrancken to demonstrate that his side can learn from this experience. The upcoming matches will be crucial in determining whether Hearts can regain their form and challenge for a top-three finish.

The hosts controlled the match from the opening whistle, rarely appearing threatened by a lacklustre St Mirren side. The breakthrough arrived in the 20th minute when Laurent Mendy capitalised on a defensive error to fire a powerful strike past Jacob Chapman.

Calvin Miller doubled the lead in the 32nd minute after earning a penalty following a foul by Alex Gogic. Miller calmly sent the goalkeeper the wrong way, establishing a comfortable cushion for the Jambos heading into the interval.

The second half began with further misery for the visitors. Just five minutes after the restart, substitute Liam Donnelly conceded a penalty for a foul on James Wilson, allowing Miller to step up and convert his second spot-kick of the afternoon.

The pressure continued as Hearts extended their lead in the 54th minute. Miller turned provider with a precise pass to Claudio Braga, who rounded the goalkeeper and slotted the ball into the net despite the attempts of two defenders to clear.

Josh McPake, fresh from his international debut for Scotland, capped off the scoring in the 80th minute. He found space inside the penalty area to fire home from close range, completing a comprehensive performance for the home side.

The victory serves as a significant boost for Hearts ahead of their upcoming Conference League opener against Nordsjaelland this Thursday. The team remains one of the highest-scoring outfits in the Scottish top flight this season.

For St Mirren, the defeat marks their fourth consecutive loss in the league. Manager Craig McLeish expressed his frustration with the performance, noting that individual errors and avoidable penalties proved costly against a clinical opponent.

McLeish admitted that his side failed to compete effectively, stating, "It's not good enough from our point of view. We shot ourselves in the foot and gave away two penalties which are avoidable. We have to rectify it."

The visitors were forced into a late tactical reshuffle after losing Niko Agrafiotis during the pre-match warm-up. Despite the setback, McLeish insisted that the team must take collective responsibility for the heavy defeat.

Hearts manager Wouter Vrancken praised his squad’s commitment to an attacking style of play. He noted that the players have embraced his philosophy since the summer, focusing on proactive football rather than defensive reaction.

Vrancken said, "We try to play a kind of football that is positive and constructive. You want to score goals because this is the nicest feeling you have in football. It's nice to see that it worked well today."

The match saw several standout individual performances, with McPake, Miller, and Harry Milne consistently threatening the St Mirren defence. Goalkeeper Beau Reus also contributed with a vital save to deny Calvin Ramsay during the second half.

St Mirren struggled to establish any rhythm throughout the 90 minutes. Killian Phillips offered a rare moment of ambition for the visitors with a long-range effort, but the team otherwise failed to test the Hearts backline.

The result mirrors the clinical form Hearts displayed in their 6-1 win over Ross County in 2023. By maintaining their current momentum, the Edinburgh club continues to shadow Rangers and Celtic in the league standings.

The defeat leaves St Mirren searching for answers as they look to break their current losing streak. The team will need to improve their defensive discipline to avoid similar outcomes in future fixtures.

Hearts now turn their attention to European competition, hoping to carry their domestic form into the Conference League. The squad will look to build on the confidence gained from this emphatic home victory.

The match highlights the growing gap between the sides, with Hearts demonstrating superior movement and tactical execution. For Vrancken, the focus remains on maintaining this consistency throughout a demanding run of upcoming fixtures.

As the Scottish Premiership season progresses, the performance at Tynecastle serves as a reminder of the attacking potential within the Hearts squad. The team remains well-positioned to challenge for the top spots.

St Mirren will look to regroup during the coming week as they prepare for their next league challenge. The focus for the coaching staff will be on eliminating the individual errors that undermined their efforts on Saturday.