You should ask this to your favourite distro packagers, not to the home assistant developers.
In any case, it is such a mess of dependencies due to load of optional packages, very active development, that continuously break dependencies on the package repo.
What advantage would bring have a most of the time obsolete distro specific repo? On a maintainer POV this is the typical use case for distro agnostic deployment, maybe flatpak, maybe docker.

Well, good for you. Now let's prove it