While RCS is nice and everything, I kinda hate that Google pretty much runs the show.
They made it so that their Messages app is the only one that supports it, because ALL their other chat apps sucked and didn't catch on (Google Chat, anyone?) so now they're like "Oh hey, here's RCS. But only on our app. lol" so now, texting people without it really sucks because you can't send full-res images like you can on chat apps like Telegram or Discord. Signal's file size limit is 100MB I believe (which sucks, but it's better than Discord's 50MB if you don't have Nitro)
Not that I'm sending large files constantly... it's just nice to be able to send full-res photos I take with my Sony Alpha camera and other larger files, occasionally. 😅
Of course, I prefer to use encrypted chat apps, but I've found that most folks won't even TRY apps that aren't Telegram or Discord, unless something extreme happens to cause an exodus, but then again... stuff like that happened on Twitter multiple times, and again with 'X' and folks STILL stayed on there.
Thankfully, I don't have to worry about sending photos and files to the very few people I know that use RCS (one friend who won't get any messengers) or basic SMS/MMS (my dad, bc he has a flip phone) bc I have no reason to send them any, and privacy isn't a concern bc we never message about anything sensitive, so I guess I shouldn't let my trepidation bother me so much.
I do hope that Google does finally release RCS so that other developers and mobile network operators can utilize its capabilities in the future, but to be honest, I'm not going to hold my breath. 😜