I have, on my iPhone, RCS messages from businesses that don’t show up as a green bubble, have (somewhat) interactive components, and exhibit non-standard (also non-intuitive) behavior I didn’t expect of either an RCS or an iMessage.

So I guess they did implement all that.

(Not that they are particularly nicely implemented - the layout and padding is all wrong, alignment is off, and it looks distinctly non-native… but that’s par for the course on iOS 26.)