I just think it's easy to forget - at least for me personally - how weird last season was, and that the WAR #s in particular were truncated.
So Segura, for instance, put up a respectable 1.0 Fangraphs WAR in 54 games last year, an improvement over his full-season 2.4 (albeit at a different position) in 2019, but ZIPS has him at 1.5 this year.
Didi's 1.4 in 60 games was as good as his 4+ WARs in 2017 and 2018, but ZIPs projects 2.3.
Obviously it is up to the players in the end. And I think the short season makes it easier for the projections to understate.
But the narrative of, "we have a great line-up and rotation returning, they just need a better bullpen" won't necessary play out simply. Conversely, if Kingery and Haseley can just do what they did in 2019 (over a full season in Haseley's case) and Bohm can raise it another notch, then the team is actually improved without adding new talent to the line-up.