I can’t comment on SwiftUI in particular, but I’ve found that a lot of things like this tend to break down in most other cross platform GUI frameworks, falling into a kind of uncanny valley, where the experience ends up being either:

1. Native feeling, but sufficiently inflexible that only very simple, common UI patterns can be implemented

2. An “uncanny valley” native ui, where things are almost native but often feel wrong in subtle ways

I think that’s why Electron has succeeded where so many cross platform UI frameworks failed: it’s so obviously not native that it doesn’t fall into that “uncanny valley” anymore