Then that's just my ignorance - I've never used Chrome OS, though I was heartened to see they were migrating to standard PWAs instead of proprietary parts.

I worked with Firefox OS back when Mozilla was seeding dev kits to software companies. It was a great concept but really seemed marred by bad hardware and then organizational paralysis. IMO this is one of the greatest missed opportunities of the last decade - an (actually) FOSS alternative to Android and iOS. No one else making attempts in this space right now has close to the same engineering experience as Mozilla.

For Safari, Apple adding any PWA features came off as them rolling their eyes, sighing loudly and then putting out a half-assed attempt to deliver years-old standards. And rather than switch to a unified extension architecture like Chrome and Firefox (which they were very close to in previous versions), they've gutted extension support to the point where you need can only bundle very limited extensions with compiled MacOS apps distributed on the App Store.

I don't really understand what Apple is even playing at by offering features but not taking them seriously. But I just don't think the LSO expiry move is _that_ user hostile in the scheme of things.