Captain Claret and Sunfish
My comment was regarding just the ability to display the AIP. You go and add a host of other functions that I don't think were mentioned in the article that prompted this thread.
Kindles do .pdf files so far as I am aware and the whole AIP is in .pdf format.
As for the iPad having GPS and being able to do moving map stuff. If you want this in the cockpit get a proper multifunction display (like the MX200) driven off a TSO'd GPS and do it properly.
I see so many photos of cockpits with a multitude of hand held GPS units and tablets/iPads etc along with a web of power cable/aerial leads. It looks a cluttered mess and a real hazard if you need to evacuate in a hurry.