Are Brock Purdy’s practice picks a problem?

Nine years ago, some were breathlessly reporting on the absence of training-camp interceptions by then-rookie quarterback Marcus Mariota. It was stupid.Interceptions should happen during camp. As then-Packers quarterback Aaron Rodgers explained it at the time, that's when he tests the limits of his ability to trust his receivers to get the ball.49ers quarterback Brock Purdy recently offered a similar explanation when addressing a recent rash of camp picks."[R]ight now is the time for us to go out and-you always hear the quarterback say experiment-but that's really what it is," Purdy said on KNBR. "Can I fit it in this window on this hitch? Can I look off Fred [Warner] or [Demetrius Flannigan-Fowles] or [De'Vondre Campbell] in a certain way and then make that throw backside? You've got to try it out. . . . [T]here's a time and a place where I'm like, 'Hey, you know what? This is practice, and I'm going to drop back and try this out.' And then you figure out [whether] it could be a part of your game or not for the season."It's trial and error. But he's making a lot of errors when he's trying something different. That's the real concern; these experiments are blowing up in his...