Preamble: This is a link where Trevor Bauer gives some quick thoughts about summer ball for pitchers and hitters. I don't think Bauer ever plays in the MLB again, I don't know if he's done something prosecutable or if his bad choices and character make him a brand pariah but I do know he's highly technical and good actionable data can come from less than nice people.
My son sent me this link because it supports his choices not to play summer ball and work on getting better. He knows I wish he'd not turned down the Cape in 2015, (who does that?) but he's accomplished / accomplishing his goal his own way. I could argue life experiences are as valuable, but really it's what's best for the specific individual.