Having an android phone in a group text is very much a real issue for young people. I have a very active group text and the iMessage features are used constantly in that chat. The nailed it with features like posting instagrams (and having them be inline, and videos playing) to being able for us to all double tap someones joke and hearting it. We do know a guy who has a droid and we do jab at him about his samsung and how his chats gotta sucks. I don't think you can name a group chat if there is a droid user present either. Right or wrong, people will be left out of experiences for green chat the same way you will miss things if you aren't using the same social media app as your peers.
At work I use Google Hangouts to converse with a few friends, and it blows my mind that when I post a URL, it doesn't inline it. It does now with youtube links, but they wont play inline. Think of it as Slack vs old 90's IRC. I dont know how droid chat shows up these days as I have long left the android camp with no plans of returning, but iMessage is a killer feature for Apple.