Really?
Playoff games for Dak by game situation (not just overall stats):
2016: Dallas down 28-13 to start the 4th quarter before Dallas tied it up and lost....so where was Dak the first 3 quarters? 4th quarters stats for Dak: 10 of 13 for 116 yards and 2 td's....Dak stats quarters 1-3: 14 of 25 for 186 yards and 1 td with 1 int LOST
2018: Dallas down 14-10 to start the 4th quarter before Dallas eventually won the game 24-22....Dak for the game was 22 of 33 for 226 yards and 1 td with 1 int so hardly a great game for Dak (especially with Zeke rushing for 137 yards and a td) WON
2018: Dallas down 23-7 late in the 3rd quarter before the eventually game ended in a 30-22 loss for Dallas (Dallas was down 30-15 halfway through the 4th quarter)....Dak from 3rd quarter drive to end of game stats: 12 of 17 for 179 yards....Dak stats from 1st quarter thru early 3rd quarter: 8 of 15 for 87 yards and 1 td LOST
2021: Dallas down 23-7 to start the 4th quarter before the game eventually ended with a 23-17 SF win....Dak in the 4th quarter stats: 10 of 17 for 126 yards...Dak stats 1st thru 3rd quarters: 13 of 26 for 128 yards with 1 td and 1 int LOST
So in Dak's 3 playoff losses, he went into either the 4th quarter or late into the 3rd quarter trailing by an average of 25-9 after doing very little in the first 3 quarters of the games......so while you want to claim Dak was only bad in 1 out of 4 playoff games, if you look at the actual games and not just end of games stats you will see that in his 3 losses Dak did nothing until the games were out of reach.