Let's be honest, immutable distros repaired a well meant feature of "do whatever you want". Yes it is possible on a regular distro doing stuff with the core files, changing or deleting them. But not everyone is prepared for the consequences. That's where immutable hits in.
The good thing is, whatever you wanted to do with the core system, it's anyway possible but with distrobox or ostree. But it is separated not integrated.
Only downside is, that it's flatpak who wins the app package manager fight. Not the best one, but the best we actually have.
Real talk, let's assume everything west propaganda said about China is real, it's not even remotely comparable with the US terror of the last decades, in any way.