There's a ton of bad changes in RHEL 9 too, which obviously weren't mentioned here, but were in the long-form release notes that most people don't read all of. Here's some of them:

* No more KVM virtualization on IBM POWER (e.g., Raptor's Talos and Blackbird systems)

* SPICE is removed in favor of VNC, even though VNC doesn't yet support a bunch of SPICE's functionality, such as audio, smart card sharing, and USB redirection

* No more taking snapshots of VMs

* virt-manager is removed in favor of a new Web console, even though it doesn't have all of the features of virt-manager yet

* SSHFS is gone (it's in EPEL now, but a lot of places have ridiculous rules that only official RHEL packages are allowed)