There should be no flathub under this setup - it's bad for security, and wastes community energy. The useful aspect of application packages is to give vendors a

There should be no flathub under this setup - it's bad for security, and wastes community energy. The useful aspect of application packages is to give vendors a path to get updates to users out of band from distro updates. If vendors aren't going to use it, then leave the packaging to the distros.