[mikeash]

My whole point is that the existence of areas which don't interoperate doesn't harm the areas that do. iMessage is proprietary, but SMS isn't, and iPhones support both pretty seamlessly.

[TeMPOraL]

Remind me, does Bluetooth work with non-Apple devices again?

[mikeash]

Of course. I regularly use it to play music in my car, for example.