Why is a separate port a big deal? You could easily put a micro-USB port right next to an HDMI port, take up roughly the same amount of space, and still have a quasi-proprietary but just as easy to use cable that is just an HDMI cable and a micro-USB cable in the same sleeve.
Well obviously not because they would prefer they be proprietary. But if you put them right next to each other, you can have your magically minimal design and still let your users get by when they're short a cord.
