It’s weird because it is a standard but Google’s implementation is not really the standard. For insurance, the standard does not use end to end encryption, Google does. Their implementation also runs over their own Jibe servers rather than carrier stuff. You gotta be a Google bestie with muscle like Samsung to get your rcs client on Android seems like.
Do you have information on it supporting rcs? I don’t see anything on the play store mentioning it. The first Google results I see say it doesn’t. Seems like it would be a big deal because if they did and would be prominently displayed as I thought only Google messages and Samsung messages supported rcs.
https://chomp.uservoice.com/knowledgebase/articles/1895488-rcs-implementation
Your cynicism is warranted but a big part of the advertised value is that their rcs implementation is end to end encrypted. Or they say it is, which presumably someone (not me!) would be able to verify.