I remember it being a pain in the ass on Fedora which tracks closely to mainline. Frequently a new kernel version would come out that zfs module didn't support so you'd have to downgrade and hold back the package until support was added.

Fedora packages zfs-fuse. I think some distros have arrangements to make sure kernels have zfs support. It may be less of a headache on those

In tree fs don't break that way