If I cannot stop using flatpak then you guys need to triple your system requirements ... this thing is sllllooooooowwwwww
Then stop using flatpaks and snaps. There's guides on the forums on howto uninstall them.
I suppose that there are a few applications that the developers will push only as flatpaks... but they are very few.
I cannot think of any reason a member should feel forced to use Flatpak.
If you list which apps you need that you can only find as Flatpak, we may be able to find you a .deb package for it.
Y'know I'd try to find a (official) deb package for every app I install (Steam, Onlyoffice, etc.) If there isn't a deb package, I'd have to improvise.
There are so many complaints about Flatpak that I think it might even be better to disable it by default.