> It's desirable for there to be only one system What gets a bit lost in the conversation for iMessage is that the protocol/infra and implementation get merged

> It's desirable for there to be only one system What gets a bit lost in the conversation for iMessage is that the protocol/infra and implementation get merged into one. This is approached in many countries for telcos by splitting the companies providing the lines from the companies providing service on top of them. It's not perfect, but it's better than previous approaches.