I am an iPhone user among a school of half-and-half iPhone and Android users. None of the iPhone users I've met care what bubbles you blow and while I have some friends that do prefer iMessage (when possible) we have all accepted that it's not cross-platform and a lot of people just use alternatives.
The bubble obsession is just a lie that tech news uses to sensationalize RCS marketing. While the point of cross-platform still stands, nobody cares about bubbles. At most we just talk about how sending SMS costs extra money than data one already has for some people.
Guineuu