I recently set up Fedora Kinoite on my dad’s laptop for him and he seems very happy with it. Kinoite is the atomic/immutable version with KDE Plasma by default. Once I’d set up a couple of things everything else he needs can be installed with flatpak (just make sure to set Flathub as the default and disable the Fedora flatpaks repo that ships broken packages all the time)

… My vacuum actually does run Linux.

!It’s a roborock with Valetudo installed so it doesn’t need internet access!<

The average person has a 1tb+ drive and doesn’t care about a few hundred megabytes of bloat in a partition they will never look at. If someone is switching from Windows, every app having its dependencies self contained is mostly normal anyway (aside from the occasional system provided dll). The only people likely to care about removing old flatpak platforms are the kind of people who don’t mind running the command to remove them.

Why not use Waydroid?

Same situation here! I was a vertical tab hater for quite a while but I’m really liking Zen’s UI so far