Ipad needs a USB port

Why is something so simple as a USB port so hard for Apple to integrate into the iPad? Think of the functionality: You could use it as a way to move files to and from your iPad, you could easily add one of thousands of USB accessories out there, you could connect your iphone to it - hell you could CHARGE your iphone from it - Voila! Back up battery! Yes I know that the 'connector' is basically a USB port - just by another name ... but I want the STANDARD USB port. I don't want an adapter to an adapter .. it just looks clunky. I know there is plenty of real estate on the iPad - even the iPad mini - to be able to add a USB port.