[vetinari]

Redhat has a problem that Fedora doesn't have: they stick to a kernel version through the entire release life cycle. In other words, they are stuck with a specific kernel for at least 10 years.

Btrfs goes though a rapid development; so Redhat has to backport everything to their ancient 3.10 (RHEL7) kernel all the time. That's a lot of work.

Fedora, on the other hand, uses current kernels. They do not have to do this work.

Redhat also cannot choose ZFS while in the license limbo; that's why they push for Stratis.