I basically agree, with the caveat that I'd still prefer a world where our write-once-run-everywhere lowest common denominator at least required native widgets

I basically agree, with the caveat that I'd still prefer a world where our write-once-run-everywhere lowest common denominator at least required native widgets and an ability to integrate new platform-specific capabilities at the expense of writing a small amount of native code, rather than barfing up web UI/UX at users (e.g. the execrable MS Teams).