But isn't appimage the closest one to the app-system from Android? Since things could be really different on many clients an "app-container" is the best solution.
Why not containerise everything? You need libreoffice? No problem, here is a docker or podman container.
BTW. I like flatpak, too. It's the most stable, but I never understand it's mechanics. There is always another pack installed, freecode, gtk, qt whatever. Even if the system has already the correct gtk version, nope, the dev decided to use the gtk image from Ubuntu.
Thx, looks like that's the info I've missed.