If your controller's internal battery stops holding a charge, you need to buy a new controller. If your rechargeable AAs stop holding a charge, you need to buy a couple more AAs.i dont see how popping in a wire to your controller is less convenient than opening up your controller, taking out old batteries and putting in new ones while then closing it again. what if you run out of batteries? then your controller is useless. i just dont see how its more convenient
But this is a future-proofing, long term thing.