Distributors entering Flatpakland

I think the primary aim of Flatpak is a separate install directory for each app, so that you can have apps installed that are ABI/API incompatible with the rest of your system. So if you have an app that needs GTK5 but your distro has only GTK4, no worries, just install the Flatpak without needing to backport the app to GTK4 or backport GTK5 to your distro. The other bits were added on top of that.