Because bad fielding 3Bmen often move to 1B.
Look, I realize he's just 20. He has a lot of time to grow and learn and improve. I'm fine with giving him more time at 3B. There's a good chance he can become decent to plus on defense over time.
I'm a little worried about learning curve and the affect that might have on our chances at a ring next year, if his curve is flatter than we hope for. I'm not jumping at an opportunity to move Devers to 1B, but it should be an option to consider, if other options don't come together or if we feel adding a clean up hitting 3Bman is the best way to help the line-up.
BTW, 1B is considered an easier position to play than 3B. It has its challenges, but one should think Devers would become a decnt 1Bman faster than he can a decent 3Bman defensively. I could be wrong, but I doubt I'm alone in my thinking.