I just don't see how this is at all true. The Castellanos from May 1 to October 1 was one of the team's three best hitters. There were times he carried them (and he was the only one of the four best hitters to not miss time with injuries). He was third on the team in HRs and 4th in RBIs. And even with his slump and poor defense he still hit enough to put up 0.8 WAR, and a 106 OPS+. Granted, we don't know what he'll be like this year and even Weston Wilson had better numbers, but only in a part-time platoon role (which they still don't seem willing to give him even in LF). It is just not that easy to find a good-hitting corner OF who's also a good defender. The Phillies haven't been able to find a good-hitting corner OF period for three straight seasons (Cave/no one in 2022, Merrifield/Hays in 2023 and now stasis for the moment).
Schwarber's not that different from Castellanos either, except even harder to trade for equal value. He's our second-best hitter and as a DH/pending FA, his trade value won't help you replace him. You probably could have traded him straight-up for Bellinger but why would you? He wouldn't have gotten you Tucker. Unlike Nick someone would take his salary but return still wouldn't be high.
Even Bohm is not getting them anything they want, all these other guys are worth less.