> 1. The Apple experience, at least on the OS side, matters less and less in the webapp world.

I see it the opposite. At least for iPhone owners Universal Clipboard and file sharing with Airdrop are killer apps.

On android, KDE Connect felt great for basic copy/pasting/file transfer between devices.

https://kdeconnect.kde.org/

On iOS, KDE Connect feels like its running a potato sack race with both arms tied behind its back.

I didn't really get it until I Airdropped a shipping label PDF to the guy at the UPS store to print from his phone, which was already set up for the label printer.