Bucks and Raptors make me feel ok about Mitchell+Ant.You and I are typically making the same points. I think in this case, there's two places we differ. One is that I believe fit matters a great deal and the defense and passing fit here is just 'ehh'. The second (which has come up before in our exchanges) is that while we both think wings are critical, I put some more weight on bigs and size than you do (or than benhogan does). I'm far from the group that thinks Embiid is the bestest, because most of us know it is not 1985, or even 2005, anymore. But I think most recent champs have had an above-average 5 and that's worth noting. That's not directly relevant here, but it is part of my roster building concern around theoretical Mitchell/Ant (as you proposed not getting Gobert and dealing KAT)
Who is the team that won a title with two primary ballhandlers who were middling passers, in your mind? That is where we differ perhaps in terms of fit and playabilty. Here's the last ten champions - which I think you'd agree is 'modern basketball' and I don't think it really fits the theory very well.
24 Celtics (Tatum for sure a better passer; White, as third guy also is)
23 Nuggets (Joker, obviously)
22 Warriors (Curry)
21 Bucks (GA, and probably also Middleton and Jrue...I guess one could try to argue this one?)
20 Lakers (LBJ)
19 Raptors (this is the closest---though Kawhi, Siakam, and FVV are all better passers than Ant or Mitchell, albeit sorta close)
18 Warriors (Curry, Durant)
17 Warriors (Curry, Durant)
16 Cavs (LBJ)
15 Warriors (Curry)
14 Warriors (Curry)
There's a plus passer in the top pair of ballhandlers for all of those teams. Often two. That is what I'd worry about with the admittedly fun and versatile Mitchell/Ant pairing. Maybe you can pull it off---those guys are super talented. But the concern I raised is pretty clearly supported by modern basketball history, too
I do agree that this would be a bet on Ant getting better as a passer: Minnesota is cooked in all scenarios if he doesn't, so may as well go all-in on that.
For bigs: I think bigs are important, and having enough scoring/shooting lets you acquire bigs who are good but not DPOY defensively, and useable but not All-Star offensively. That's my issue w Minny's resource allocation.