Earlier quoted context omitted.
Redhat doesn't ship btrfs because they don't have any engineers working on it and thus can't provide support for it. Anything that ships in RHEL is comes with a strong support guarantee that they just couldn't hold up for btrfs. The SAS controllers may be a similar thing, maybe they don't have the hardware anymore to regression test against.
rather they don't have any customers demanding it. if they had, hiring engineers to support that should not be the problem. incidentally, i never had a chance to figure out what the big deal was with the centos stream change, because i was already forced to switch to debian because btrfs was removed from the centos kernel.
Funny!