I hope we get something that's not distro specific. Docker/podman work for a lot of stuff, but some apps/services aren't available via them, and I really would like an alternative to snaps, which often can ship those apps.

Also, these and the fedora one mentioned in the other comment appear to target immutable distros. Snaps work on any distro.

Very cool to see that System Extensions are being adopted and that the tooling is improving to reflect that!

This reminds me of the sysexts-manager project, which is worked on by a Fedora Atomic maintainer.