RHEL comes with a price tag (although I think they now have free developer licenses.)
Also RHEL development moves sloooowly. This is a feature and one of the main reasons to go with RHEL instead of not only unsupported distros but also supported-but-faster-moving distros, kind of like on Windows LTSB (I know to little about both to compare them, but enough to know that in certain organzations the promise that it will stay the way it is and by default only receive security updates is a huge feature.)
Also RHEL development moves sloooowly. This is a feature and one of the main reasons to go with RHEL instead of not only unsupported distros but also supported-but-faster-moving distros, kind of like on Windows LTSB (I know to little about both to compare them, but enough to know that in certain organzations the promise that it will stay the way it is and by default only receive security updates is a huge feature.)