Comment by jeroenhd

RCS is an extension of SMS and has quite literally been "SMS but more capable" from the start. The protocol on the wire looks a lot like MMS over LTE. Registration and communication mostly happens over SIP and RTP like in the latest MMS specs.

The early versions of RCS were barely implemented. Android and iOS didn't bother including clients, carriers didn't bother hosting servers because the spec was optional, and third party applications made by carriers were launched and then died because carriers couldn't explain to customers why their app was better than WhatsApp e.a. for those in the market for alternative messengers.

I think it's safe to say that RCS would've died a quiet death had Google not used it as a basis for their own Hangouts alternative built into their SMS client.

When RCS was first (soft) launched back in 2008, E2EE messaging practically didn't exist. Google slapped E2EE on top when they hosted their own iMessage alternative to bring it into the modern era but the base spec was still "what if MMS wasn't so outdated and restricted".