Nobody, especially not Apple, decides something like that in one email or even a single conversation. Also this is the company that goes to great pains to hide

Nobody, especially not Apple, decides something like that in one email or even a single conversation. Also this is the company that goes to great pains to hide what everybody can see about their plans. Keep that in mind. Obviously, This is something that has been discussed over and over and over since they started planning the iPhone. I've watched Apple work, they don't hash out what their products are going to do through emails. Sorry, but you're wrong. The idea had clearly occurred to them way before any of these emails that you're referencing.