There is no reason (that I'm aware of, if I'm wrong people should prove it) for any of this overcomplicated crap to exist when appimages exist. It really proves that these corporations are just trying to gain more control over Linux, when they keep pushing their bullshit when something that accomplishes the exact same thing exists, is simpler, and also does it better. Is there a single thing that those corporate formats do that you can do with appimage? Hell, you may be able to do all that with Guix as well. Still have to try it myself and see how good it is for running older versions of program, which is what I use appimages for, mostly. Example being mGBA, I got one for that because an update broke Pokemon trading, and I don't care about updates, the older version works fine.