flapak when i was using it on arch always had issues getting gamescope to run as the flapak version doesn't match the version in steam. with wine adopting support for native Wayland and improvements to Vulcan layers i think flapak version may start to get more popular. but for now the main limiter is, "do i need gamescope to play?"

It's just kind of annoying to not have your files where they normally are.

The sandboxing sometimes breaks applications or requires additional configuration. And I don't like that it's a separate thing I need to maintain, although some package managers pair main package updates etc together.

And as a NixOS user, I prefer to use nix to handle as much of my system as possible, although flatpak at least is useful as a fallback in a pinch. Of course, this is a niche within a niche and mainstream users, particularly those using immutable distros can and do benefit from flatpak.

Imagine having a 40% market share and losing it all. Honestly, it's kind of incredible how far Ubuntu has fallen. Hopefully it serves as a lesson for anyone thinking about alienating their users.