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Google is silently blocking RCS messages on rooted Android phones and custom ROMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I was able to get RCS working again yesterday by updating to the latest version of Play Integrity Fix, but if that hadn't worked, I would have disabled it and then probably switched over to Textra or Yatta for texting since RCS is basically the only thing keeping me on messages for texting.
I have it disabled anyways along with the Carrier Services app. Guess what: my battery life improved dramatically.
Carrier services isn't required for RCS anymore pixel phones brand new don't even have it installed.