The flatpak "app" system has always felt like amateurish techbro crap to me, but today I finally put my finger on why.
The website is loaded with how-tos for installing it & packaged applications ("apps"), but there's not even a hint of how to maintain, manage, remove, or update them.
It has a set of halfway decent manpages that *do* say how to do these things, but there's literally zero reference! You have to just know they exist, & you have to just know `man flatpak` is how you start.
@arielmt honestly between snap and flatpak i think both are egregious mistakes and the linux development community needs to use a "non-free" computer again to figure out what is it that "normal" people expect of them