If Lewis can’t handle heing sent down, he cannot handle Major league baseball. No harm at all will be done to Lewis. Anyone that fragile is absolutely garbage after a few months.
He played well, but not that well. He has a ton of stuff to address. He needs to play everyday.
This is a game of adjustments. The league will adjust to him, and he will regress.
I think if he was ready for multiple positions (CF, 3B, SS), he could work spelling Buxton and correa. He hasn’t even played a long season yet. He needs to work on the long term consistency stuff (emotions, taking care of the body,etc).