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i think traditional UI should be decoupled from the language - only providing CLI and web UI (w3c web standards).

Apple's ui is very nice, but you're stuck with a whole ecosystem for life. If you want to cross-platform, as you mentioned, well, all hell breaks loose: React & co, Flutter, web assembly.

a unified, all-batteries-included system is excellent for the manufacturer/provider - they can plan, invest, manage and rollout products at a desired rate. but for developers, third-party, and consumers is very costly, intense and risky.

fun-fact from Steve Jobs bio, he was interviewing a tech hopeful for a job, the guy showed him a prototype of what would become the Dock (aqua + animations), created using an Adobe product. Abobe etc had powerful, flexible platforms - unfortunately the market was driven by eager tech geeks - so it was easy to get curried away with fancy UIs. However, that was (20 years ago) an educational issue - not a tech issue.