The people who pay for RHEL want the stability. So a faster-updating OS is technically superior but requires more regular testing & development work from the customer side.
The people using CentOS also wanted the stability. And if RH had added Stream as an option, that would have been totally reasonable and a great move. It was the way they killed the stable version while proclaiming that Stream was totally a good replacement that was disingenuous, because it was not a replacement for "as stable as RHEL without cost".