Have you actually tried using uBlock Origin Lite or Adguard on MV3? I've used both and they have worked flawlessly. Currently I prefer Adguard because all websites are opted-in to cosmetic styling by default.
I can't, because MV3 is not in my version of Chromium yet. But I don't need to: I know exactly how MV3 works, I have experienced that approach on iOS and it barely works for the most simple kind of ad-tech. Calling it "flawless" sounds like outright FUD to me.
FUD is making a dismissive claim without actually testing it. Using the stripped down content blocking in iOS is hardly comparable.
iOS works in the exact same principle as MV3.
Does uMatrix work on MV3?
uMatrix is discontinued, so it's not being developed for MV2 or MV3.