I am building plasma-discover in EPEL9. plasma-discover requires rpm-ostree-devel to build in EPEL9. We would love to have the ostree functionality in the EPEL9 KDE Plasma Desktop, just as it is in the Fedora desktop.
Note that the rpm-ostree dependency is only used as a build time check to enable the rpm-ostree backend, which is only useful for systems like Fedora Kinoite. I don't plan to make a CentOS Stream version of Fedora Kinoite (which does not prevent anyone else from doing it, just stating that I won't). I've made a pull-request to reflect that: https://src.fedoraproject.org/rpms/plasma-discover/pull-request/17 I don't know if have other users of this devel package so leaving open.
With the change above to plasma-discover, I no longer need rpm-ostree-devel in CRB. If your team has already done alot of work to start putting it into CRB, then yes, continue that work. But if you haven't done anything yet, feel free to close this without putting it in.