This. One port to rule them all. Device doesn't have that cable right now? Either replace the cable if it it's replaceable or put a small adapter on it. 2 years time this will be a forgotten "issue" and things will be much simpler because everything will simply be USB-C. Power? USB-C. Video? USB-C. Storage? USB-C
I don't know, I think the one-port ideology works fine a macbook maybe even the macbook air but for the pro I'm expecting more port variety. Not everything is USB-C and I own a lot of things that are not USB-C. Like 3 external memories that use USB 3.0, sd cards from my camera, hdmi cable to connect to projector, etc. I have to carry a dongle now for all these things on a pro device, it would annoy me a little.