The issue is, he doesn't really have to go scorched earth because they wont be starting from "Bo is .sub 600 OPS hitter,, Springer is a sub. 650 OPS hitter... pitching will certainly be worse...." There's a reason projections exist, in order to filter out people's emotional and irrational blind spots.
Like, you wouldn't expect Bo to be a 5 WAR guy either, but you'd start somewhere in the middle. 2.5-3 FWAR is not an unrealistic expectation. It's not unrealistic to expect that Berrios will bounce back a little. Its not unreasonable to expect that Vlad probably wont be 2021, and probably wont be 2023. It's not unreasonable to think a healthy Romano and Green would be solid at the back end of the pen. It's probably realistic to expect a reduction in effectiveness from Bassitt, but not to the point of being unrosterable trash. Ditto Gausman probably takes a step back from his ace-like numbers, but not to the point of this season's numbers.
Like, when these guys are figuring out what to do, they don't just look at a run differential from this year and somehow think they will have to improve by 200-300 runs, that's an impossible task, they're going to start with projections and build from there because that's what rational people do. Sure, they'll have some numbers on the lower side, and some on the higher side.