I absolutely agree on that. It should be clear to the user what protocol is being used, but that isn't Apple's goal. If that was the case, the bubble for RCS messages would be something other than green since green currently indicates SMS. The way they're doing it, making RCS bubbles green too won't do anything to tell you what protocol you're using, but it will specifically reveal you aren't using iMessage, and continuing that in-group mentality is the goal.