New things (especially 12 years on) shouldn't be "do simple things simpler, and drop down to old ways for complex stuff". It should be "do complex things simpler".
You strongly disagree with what? That new tools shouldn't just make simple things simpler?
> Make me write less code, make me spend less time fixing it.
But that's exactly where SwiftUI fails, doesn't it? The moment you step outside the "the only UI you can do is lists", you are exactly in the "write more code with weird failures" territory with "just fallback to AppKit for anything even slightly outside of the extremely limited sandbox".