Also, this is not about Android or iMessage specifically, it's about interoperability. WhatsApp etc. are just as guilty. Wouldn't it be amazing if you could me

Also, this is not about Android or iMessage specifically, it's about interoperability. WhatsApp etc. are just as guilty. Wouldn't it be amazing if you could message all your friends in a single App, without having to think about what platform they're using? If you could just see and respond to all their messages in a single thread, one for each friend? The number of messengers I have installed on my phone (and I'm forced to use regularly because they're not interoperable) is madness.