CentOS 9 came out ... ~~ 1.5 years ago? Arguably borderline for being considered obsolete.
I'm not suggesting indefinitely, but I think we're sometimes too aggressive given corporate realities.
CentOS 9 will be still supported FWICT, the original mail talks about CentOS Stream 8, which was released about 4 years ago and goes EOL on May 31, 2024, which is not long after Ceph S will be even released as stable the first time, possibly even before that if S gets a bit delayed like reef did..
I have no skin in the Ceph on CentOS game, but IMO it doesn't seem aggressive to stop support for a distribution in a release if the distribution is going EOL around the time of when said release is actually done. I mean, I wouldn't expect that Debian Bullseye still gets support for Ceph S, it's main support will be EOL in ~ July 2024 too. But maybe not the best comparison as major upgrades between Debian releases are relatively easy and work since decades, so it's not as big of an issue there for corporate users.
I am a bit confused, I think I missed some news. "Ceph S"? Is that a new stream version or so? Ceph is currently still developed on rhel9 not? Or is this switching to a stream version? For my upgrade path I would like to chose the distribution closest to the development/testing environment.