Flatpak provides an alternative to the distro package but the distro package is still useful. The distro package provides tighter integration with the OS and provides stability guarantees that Flatpak does not. The distro version also allows an OS deployment with a single tool. They’re both useful.
The distro package in question here is a Fedora-specific Flatpak, not the Fedora-specific RPM distro package version. From my understanding, it is missing things like patented codecs which then causes bug reports to be filed with upstream, OBS, instead of the ones responsible for the package, Fedora.
Fedora has its own Flatpak repo as the default instead of Flathub (which has the official OBS package from the upstream developers).