long ago, the integrated feeling of Apple MacOS was a great selling point; decades later, daily use of the web, more phone than desktop, Windows low-bar junk and other factors change the equation.
If a smart user here today says that recent network-centric apps are OK with him visually, then maybe they are OK?
I think Apple made a strategic error when they failed to embrace DOM/browser engine-based toolkits like Electron on the Mac. If they had applied their leverage, of which they have plenty, the technical challenges of better native integration and support for the wide range of traditional Mac affordances would seem to have been quite manageable.
There's some reason to your proposition. Directly integrating/"embracing" foreign toolkits/web engines is the last thing Apple would ever do, but exposing more of the underlying machinery to allow third parties to integrate better - yeah, sounds good.
On the topic of Rust GUIs on Mac, this was recently in the news:
If a smart user here today says that recent network-centric apps are OK with him visually, then maybe they are OK?