[bonzini]

This is not entirely true; some packages have been removed from RHEL7 to 8 to 9, because the interpretation of "if we ship it we support it" has become stricter. RHEL9 is as new or sometimes newer than Debian 11 (bullseye).

[Beermotor]

RedHat also backports fixes, security patches, and (occasionally) features to existing RPMs without incrementing the minor version.

For example fuzzywhatsit-3.0 in RHEL could be functionally equivalent to 3.5 in another distro.

[yrro]

They even rebase packages to new upstream versions in point releases (where doing so maintains backwards compatibility, of course).