RCS only increased the meta-data the cellular providers and messaging apps is selling on you.

They don’t care about the content in your message, so e2ee is useless in this case.

They’re selling who you message, when, and where you are when you do it. They collect data on which cellular tower transmitted your message. And now with RCS they also know when you read the message.

Which means RCS is just as useless in terms of privacy. They only enriched the data. So it’s probably worse.