But they do, Its flatpak. Its supposed in mint's app store and most already use it in most distros.

This debate has already been over. Even flatpak steam which I've used as long as I use flatseal to allow it all my system files it functions exactly the same as regular steam. Nobody cares about downloading 1gb which will be used by all other apps anyways.

Also it's only grown since its launch and its here to stay. Official companies like discord have supported it. It's official now.

Also I don't notice any performance loss from using a flatpak, feels like the same app.