When Dez fails to catch a pass that he has to bend down for or lay out for (both have happened in the end zone this year), and you make the criticism "Dak didn't let Dez high-point it," then when Dez high points it and comes down with it, you don't get to make the criticism "Dak overthrew him."
1. I'm not sure at whom this comment is directed. I would certainly say Dak overthrew that pass and was rescued by Dez. But I haven't criticized Dak for failing to let Dez high-point balls in the past.
2. Even if I had criticized Dak for failing to let Dez high-point balls in the past, why would that preclude me from observing that when he did give Dez a ball to high-point he was a bit off in his execution?
3. Context matters: you reference end zone passes. If Dak throws a ball for Dez to high-point in the end zone and the pass sails, it's just an incompletion. The real issue with the pass in question is that if Dez doesn't make a spectacular grab, high-pointing the ball, it probably ends up in the arms of one of two safeties that are just behind him, turning the ball over on Dallas' side of the field and maybe even resulting in a pick six.
4. In the end the play worked out so this is all much ado about nothing. I still think Dak is a great QB. I just think he overthrew that pass a touch and was somewhat fortunate that Dez bailed him out.