Well, that's the paradox isn't it? The Phillies clearly value defensive ability and at least some versatility at all three bench spots. I do want someone better than Cave but that person needs to be able to play the OF better than Grossman, or be able to play 3B. And if Merrifield is still the first PH choice against a RHP he'll just stay in the game.
Grossman needs to be on a team that can give him ABs at DH too.
I certainly see them PHing for Marsh and Rojas occasionally but never Bohm. They won't even defensively replace him much I reckon. You gotta continue to let him sink or swim, or you actually do need to get a LH 3B to pair with him.