No one said the defense was good. They were terrible. But that doesn't change the fact the QB wasn't all that good either.
To say that no QB could have won that game is missing the freaking point. If Dak went out there and tore it up from the start of that game and lost a 49-43 barn burner, that's one thing and might make your point more palatable. But that didn't happen. Dak was dreadful in the first half and was a major factor in why the Packers built a 27-0 lead in the first half (along with the defense as a cause). You can't change that reality. You can't just say, gee, I am not going to put any blame on Dak despite the fact he played terribly, especially in the first half, because the defense also played bad. It's bizarre that people would give a player, who played poorly, a pass simply because someone(s) also played poorly.
Yes, Dak playing poorly or inconsistently in another big/playoff game is a concern. How is it not?