I think people are missing the point with Dak.
You are correct. The defense was hideous and the reason they lost.
But this is the difference between Dak and a great QB. The score was 20-0. (7 of those points thanks to a Dak INT) Your defense was awful, your offense was awful. You are driving with a chance to score before half and get the ball back before half. Pick 6. You just gut punched the whole team with that.
Brady was famously down 28-3 vs ATL. If NE loses that game surely no one blames him, but we know what happened.
Two other games I can think of where the teams lost was Hurts vs KC last year and Allen vs KC in the famous 13 second game. Those QBs KEPT their teams in that game. Dak didn't.