I get that, and probably don't disagree, but I still think it's ultimately because the Phillies pitchers are just better. You cite Busch (27 points better over Turner's 113), Happ (33 points better), and PCA (26 points better vs Castro's 108), but Swanson is 34 points better against LHP, Hoerner 71 points better, Suzuki 17 points better, Shaw 18 points better. Tucker (138/140), Kelly (118/123) are pretty even. You lose some defense with Turner and Castro for sure, but we've got some serious talent against LHP.
The Brewers v Phillies thing is interesting because I agree that the Phillies are just the better team, despite what the record shows you. But if you're going to go that route....I don't know, Ohtani/Betts/Freeman and then Yamamoto/Ohtani/Glasnow/Snell is pretty hard to beat! I know they aren't an option for the second round, but I'd really like to avoid them in round 1.