Earlier quoted context omitted.
Messages inflexible reliance on SMS for communication to non-Apple devices is definitely an Apple issue, in my opinion. Apple has made it clear that they continue to default to SMS for non-iPhone communication solely because it's unpleasant for everyone involved.
There's apparently even "green bubble bullying"[1] of kids who have Android devices and thus have their messages appear different. In this particular way Apple is happy compromising the mental health of young people to secure a larger market share - it's awful and they deserve a lot more negative PR for it. 1. https://www.wsj.com/articles/why-apples-imessage-is-winning-...
My carrier charges an arm and a leg for international texting, and if distinguishing between texts and iMessages wasn't as easy as it is, I would probably have to pay hundreds in carrier bills at least once.