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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.
Being able to send pictures and videos without SMS/MMS downscaling them to like 144p (hell I've had it be even worse than that for videos sometimes) is incredibly handy. That's the main benefit for me. Others have commented about the other features. And I'm fairly certain the article did state E2EE will be implemented.