Well, to be fair, they all have. Mahomes had 14 picks. Allen 17. Goff and Allen crapped the bed several games. Stroud and Lamar have been the least turnover prone.The 49ers whole playoffs rides on Purdy more so than other QBs. Purdy has shown a couple of times this year that he can fall down into the gutter and not really recover. He can't have a multiple turnover game or it's lights out for the 49ers
This is part of why I think the Ravens game was actually a good thing for Purdy. Made a mistake with a pick early and then tried to play hero ball the rest of the game. Mistakes happen but limit them.
That's what he has to learn. The concern is not turning the ball over, it's that when he does he can't seem to get back into a rhythm
As much as you reference those other guys I don't think anyone worries the wheels are going to come off mahones.