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How RCS on iPhone Will Make Texting Better for Everyone
(www.cnet.com)
This is a most excellent place for technology news and articles.
It only has E2EE if you use Google's proprietary implementation. And even then it's not the best implementation of E2EE.
There has been some chatter of adding it to the RCS spec, though.
Not that it matters that much, on Android you're still locked to Google's RCS API and the same will be true to iOS with Apple's.