Go back to last year's playoff loss to the 49ers. Dak had a sub-par game for sure. But outside of CeeDee Lamb, name me one player that had a good game. One.
The other receivers? Did the offensive line protect well? Did they run block well? Did the running backs excel? Did the defense get a ton of pressure? Stop the run? Get some turnovers that could have helped? Did the coaches come up with a spectacular game plan only to have Dak muddle it up?
I hear all the time that conditions "have to be perfect" for Dak to win. But how many QB's don't need a strong team around them? Look at Mahomes this year with bad receivers. NOT comparing Dak to Mahomes, but if a "generational" talent like him can't be expected to overcome lousy support, why expect Dak to do the same?
Once you find a franchise quarterback you keep him. Then you find a way to put him in position to succeed. To that end the Cowboys (especially under Garrett) have failed Dak; just as they failed Tony Romo before him.