@lanodan @a1ba @dushman @icedquinn ZFS has major issues with downsizing and dealing with unequal drive sizes.

Or basically, if you don't have the money to replicate an ideal enterprise-like environment, ZFS rapidly shows where it falls flat and btrfs doesn't. bcachefs likewise doesn't and attempts to fix some of the limitations which btrfs has (such as the lack of caching support, etc).