I’m in the EU, don’t use whatsapp but know a sh*tton of people around me do. It annoys me greatly and I truly hope I’ll be able to move them away little by little now that RCS is here.

Annoys you why? Signing up just requires a phone number... It's the least invasive of all the social network type things. Also RCS hasn't been widespread until recently, WhatsApp has been around for over a decade.

I do not want to use multiple apps for chat, first, and I especially do not want to use anything from Meta. I know it’s E2E encrypted, but they still get to know who I’m talking to and how often, and other metadata. I don’t want that.