I've got an Android, and I recently went on a vacation with a group of friends who all had iPhones. I did feel a bit like a leper in the group chat we had set up for our vacation, and it wasn't because of green and blue bubbles. Not only was the experience pretty broken for me, it essentially broke the experience of everyone else. I couldn't do emoji responses, which are a huge way folks communicate in group chats these days. Videos I received on my phone were essentially unwatchable. Videos or images I would send to the group would randomly just not show up on some people's phones. At the end of the vacation my good friend said flat out (jokingly, but still with a point) "Dammit hn_throwaway_99, just get an iPhone".
It's the breaking of group chats that makes iMessage the lynchpin of Apple's anticompetitive stance here.