> flatpak is like a cross-distro snap that actually works

You are right. Besides proprietary app store, Snap lacks even basic sandboxing in non-Debian based distros. I can't believe that Canonical engineers thought this was a good idea when designing a cross platform packaging format.

Flatpak got everything right from it's initial design. Multiple repositories, Sandboxing that actually works in any Linux distro, OSTree to reduce disk space usage etc.