>>106411264
I wouldn't say it's trivial, because it requires you to boot into an environment that supports ZFS, use it to create a ZFS pool and bootstrap the OS onto it.

Also, I don't think there's any legal limitation preventing any Linux distro from shipping with ZFSBootMenu preconfigured. It's just easy enough to do that whoever wants to have root on ZFS can just do it, without needing a whole distro to be preconfigured for it. But yes, out of the box support would be nice.