I agree with what you found, keep in mind their jet providers are very very new so they seem pretty rough, but yes the community around crossplane and the oam spec ( which crossplane uses ) is very small, kubevela also uses the oam spec and sadly its mostly used in Asia, although Microsoft is a sponsor of the spec, no idea what they use it for though, both crossplane + kubevela would be a interesting start for a control plane but they seem very niche