I remember when APFS was introduced, it was framed as being for everything from the Apple Watch to the Mac Pro. Would ZFS have scaled down to whatever puny hardware is in the first-gen watch?
I imagine the main reason to use it would be that you have ONE filesystem that runs everything, everywhere. Though come to think of it, I feel like snapshots and relative ease of creating new filesystems in the pool could be handy for upgrades.
Zfs still has a huge overhead. It needs more ram than a watch or even phone is going to have - until they start packing enough that losing 4gigs of ram to overhead is fine.
