I don't understand, I'm on Android so if I want full size pictures/videos, group chats, secure encryption in those group chats, and possibly any extra features like tapbacks/stickers, etc. then I have to have the iPhone user download a 3rd party app. I would say the majority, not all, but most fall into these categories where I want to use features SMS/MMS does not provide. No I don't want to send a link to a video, don't want to download another app to group chat, etc. THOSE are the reasons why iPhone users dislike Android conversations. It's not about green bubbles like we are in 3rd grade and I'm not cool, it's about green bubbles = headaches for iPhone users.
I don't want to extrapolate my individual circumstances onto others so can only speak for myself, but there is no way I could ever make it work outside of having iMessage. So yes on paper I could switch to a 3rd party app, but in reality it's so far from being practical it doesn't even register as a solution.