Only after a third party makes an AUR for it. I'll stick to an OS where the developer can publish directly to the users without 15 different packaging formats, thanks.

Again, flatpak, appimage, docker ... you can use one of these, don't have to use 15.

No, the developer can choose one of these. As a user, I have to deal with all of them because I cannot choose how the developer distributes it and there is no standard. If I could choose, I'd use AppImage for everything (since it is the only one that is portable) but I can't do that.