[curt15]

ZFS is widely used with Linux in HPC (https://computing.llnl.gov/projects/openzfs). Is asking users to install ZFS separately really that much of a lift for ZFS's target audience?

[remexre]

Being out-of-tree means that kernel refactors break ZFS, and that it has a lot fewer hands and eyeballs available for the kinds of bugs that require internal design changes to fix (rather than paper over).

[josefx]

Most people don't blindly run the latest kernel. I don't think I ever ran into issues with out of kernel modules on a stable distro.

[pyuser583]

Asking for seperate install of a filesystem is a big deal. It severely limits how the filesystem can be used.