Which high end cameras are using proprietary USB cables? I know all my Canon's use standard USB connectors, so I can just swap out the cable. And honestly, I've always carried a card reader with me because there was never a CF slot in a macbook
But you're totally right, with these updates Apple seem very confused as to who their customer is. They keep saying pro, but as a pro (be it photographer, or developer, or whatever) I need compatibility and flexibility. Only having one type of port (and a fairly rare one at that) is neither. Those Surface Books are looking mighty nice.