After the MacBook came out, but before the new Chromebook Pixel, I was telling people that Apple only put a single type-C port on their MacBook for this reason. I said "When PC's come out with type-C, they'll have multiple ports, but you'll only be able to use one of them as the power port. Apple would rather have a single port than have such a confusing setup."
Of course, then the Chromebook Pixel came out and proved me wrong. I still expect some PC makers to try and shave costs by only supporting power input on one of the type-C connectors, but the Chromebook Pixel example will ensure that such an arrangement will get slammed by reviewers.
Is that definitely the case? It's still not unknown for laptops to have exactly one charging downstream USB port, unlabelled, so that some devices will charge from one port and not another. I wouldn't be at all surprised if the same is happening with USB-C.
