I was so annoyed when I saw this. Luckily you can deactivate it. I've done so, moving on with my life. Can't believe how much I hate modern design pet-peeves and features... mozilla VPN app recently switched to having a menu bar at the bottom for 'home' (default view), 'messages' (update notifications and crap) and 'settings'... because this is how to do it now... of course it has fancy rounded corners... sigh... For…
While I agree with most of what you said, it appears you are implying that RCS provides a security guarantee somehow that Signal is impeding. RCS is badly fragmented, mostly not E2E (except Google private E2E extension), and does not have Apple's buy in. Signal does clearly indicate that SMS chats are not secure.
Signal originated as ChatSecure- the encrypted SMS app.