It is not a coincidence that the Iphone looked similar to the ipod. Heck, the ipod and ipad are very similar in form-fit. The iphone/ipad is an ipod/basic ipad with the telephone electronics. That is how Apple markets the product family. Both have wifi, both play all of the apps. The only difference: the telephone electronics.
Plus, I bet that one of the decisions many folks make when buying an iphone is “does it play my thousands of dollars of iTunes music.” The answer is yes and it is no coincidence.
I’ll have to take your word for all that since I don’t own any of those products but it is still true that need has never created anything. PERCEIVED need may inspire all kinds of creativity in people but NEED NEVER creates anything.