While I believe morale is good, I don't think that's why a new 1b was not sought. Campbell has been practicin' and practicin' at Worcester, his hitting is getting better, he has an 8 year contract with the Sox, and the Sox are knee deep in good hitting/fielding outfielders.
As far as I'm concerned, Breslow "fixed" the Sox hitting by signing Bregman, who is also a good third baseman. Of course, as we are seeing with the Giants, one guy can't really fix a lineup. So the improvements in Story and Rafaela have been humoungously useful. The addition of Anthony has been even more so. 2024 Duran seems to be sneaking back onto the stage. Abreu is still a good against righties. Gonzalez at 2b/1b solid, mostly against lefties.
Losing Devers as the DH was a big loss even though, in the end, a necessary one. He was almost as good a DH as JDM in his prime when he lit up the 2018 Sox lineup. But all the other Sox hitters this year have been so good he really hasn't been missed that much even though he was better than Yoshida/Ref.