Further to my recent post, the good news is that the ZFS team have released a version of ZFS which will work on the latest Fedora:
The 0.6.5.9 version supports kernels up to 4.10 (which is handy, as that’s the next kernel release I can upgrade my Fedora 25 to, so there’s some future-proofing going on there at last). And I can confirm that, indeed, ZFS installs correctly now.
I’m still a bit dubious about ZFS on a fast-moving distro such as Fedora, though, because just a single kernel update could potentially render your data inaccessible until the good folk at the ZFS development team decide to release new kernel drivers to match. But the situation is at least better than it was.
With a move to the UK pending, I am disinclined to suddenly start wiping terabytes of hard disk and dabbling with a new file system… but give it a few weeks and who knows?!