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.
A variety of small but useful features. Typing indicator, reactions, read receipts, and larger media limits. I'm sure there's more, that's all I can think of off the top of my head.
You can send rcs messages over Wifi even if you don't have a cell signal, like iMessage. You can also get iPhone emoji reactions to messages instead of getting a text message saying "X hearted this," or w/e
The best that the SMS protocol can tell you is whether the message was delivered and even that isn't a requirement. SMS has delivery receipts, it does not have read receipts.
Well for one, iMessage runs over the internet and Apple isn't a telecom company (Verizon, etc)
Either way, the TL;DR is that either there must be a backdoor or something else to allow law enforcement to access communications that run over telecom companies. This doesn't apply when a user does it, but definitely when telecom companies design a messaging protocol.
yes I know Apple isn't a Telecoms company but you need a SIM from a Telecoms company to use iMessage. RCS runs over the Internet too, yet you also need a SIM card for that. Also Telecoms companies aren't designing message protocols anymore. I don't think you know what you're talking about.
One feature I found extremely useful is that you can now quote previous texts. Less useful is the ability to react to texts with emojis. But it's good for letting someone know that you saw/liked their message by reacting with a thumbs up.