First problem in Linux desktop OS: you download a flatpak, or other file, click it, and "no application found" or it opens in a text editor. On a GUI OS, if a user has to go to the command line your design is wrong.

I chose popos, because the second I wanted discord or Spotify on fedora I had to go through a whole page of commands to do it, and it didn't quite run correctly.

When I installed some GUI apps on fedora, they wouldn't show up on the start menu. Had to manually add them, via command line.

Another is media thumbnails. Include ffmpegthumbmailer by default. Don't make me command line basic functionality.