The kernel has no native support for ZFS.
Ubuntu may ship with ZFS, but that's one distro. Meanwhile, RHEL etc won't even touch it.
On Linux, XFS dominates and likely will continue to dominate the server world, meanwhile btrfs will slowly erase ext4 in the desktop side of things. Android/Embedded have always used their own different filesystems so it's irrelevant there.
Neither does it have accelerated Nvidia card support that could be used for things like HPC/AI/ML. Yet I'm administrating an entire cluster of Ubuntu machines with cards just fine.
We generally use the "nvidia-driver-NNN-server" package.
If you want to live ideologically pure no one is going to stop you, but someone of us need to get work done.
ZFS is in a very weird position on Linux. It’s unfortunate but that’s mostly due to Sun and Oracle so I don’t feel bad stating people shouldn’t use it.
What defines a "serious distribution"?
Linux is unlike Eg freebsd not a monolithic operating system, but only a kernel so it is in my opinion not really right to say that it has no support.