ZFS isn't catching on because it solves a 1990s-era problem that people just don't care that much about right now. People are focused on cloud for the moment.

ZFS isn't catching on because it solves a 1990s-era problem that people just don't care that much about right now. People are focused on cloud for the moment. Cloud storage doesn't require the application developer or user to care about the filesystem, and clouds are not implemented with fancy filesystems on the individual hosts, but rather using fancy facility-wide filesystems that have better management and durability features than ZFS offers. ZFS would have been totally brilliant on a 90s-style multiuser enterprise or higher education deployment, though. It just missed its window.