CR is being actively developed. Way more than RR. It just takes time for them to migrate to the new version.
Oreo came out August 2017. We didn't get a ROM until the very end of December of that year. It wasn't until about April/May 2018 that it was stable and all (pretty much) the features from Nougat were restored. Even then there were still recurring issues, especially around the proximity sensor.
OMG! I was really sad I thought we lost you Gavin! Thanks for continuing supporting the device!