I love Spice too but it has been deprecated for a while now.
https://access.redhat.com/documentation/en-us/red_hat_enterp...
That doesn't mean spice is being deprecated.
EDIT: just an FYI for everyone interested, here's a bit of info about how Proxmox is handling it. TL;DR Spice is still at least maintained until 2029, so it's not going to just go away anytime soon.