I don't want to use RCS in supported regions, so I suppose that's fair.
I don't like RCS because it appears to eliminate several aspects of SMS that it an acceptable messaging system for me.
Took me a while to figure out why I was not able to pull MMS over WiFi anymore!
(My "hack" was to have a SIM from a country where RCS/Chat is enabled, but actually using it in a country where RCS is not yet supported.)
Revision Control System? I think I remember that...
iPhone doesn't support RCS. Therefore, it's dead on arrival.
Apparently I have RCS fully supported. I only learned about this "feature" when I found an SMS I thought I had sent was sat there with an error message. Found out how to turn it off, will never use it again. I don't see how anyone ever thought "upgrading" SMS to be like WhatsApp but less reliable and still no encryption would be an improvement.