That's a very strong defense of a piece of software that deliberately prevents you from communicating with people that haven't bought the same piece of electronics.

Think on that for a moment - "Sorry grandmama, I can't send you iMessage or talk to you in person since you didn't spend your pension on an expensive Apple device."

For something as fundamental as human-to-human communication, closed, single vendor, protocols and systems deserve every criticism (and yes, Google deserves it as well).