I have experience where my child with a working android phone was socially excluded by the girls with hand-me-down Apple products because she couldn't "text" with them. Most of them didn't even have working cell service, just iMessage over wifi.
I was able to send full fat (640x480 at the time) videos to people over SMS in 2008 using a flip phone. I was able to do group chats and share photos and all sorts of nice things.
I could do all that in android land as well over SMS with other android users, before RCS.
It's only when my iPhone having family members attempt to send me multimedia texts that things don't freaking work. My dad's new wife tried to send me pictures of their wedding and Apple reduced them to a hundred pixels because fuck you.
Some of this blame can be placed on carriers but they don’t care.