zhenya
macrumors 604
I was mistaken in believing the thunderbolt display had USB 3.0 which led me to believe Thunderbolt 3 had the bandwidth for it. Thunderbolt 3 supports 40gbps, and USB 3.0 is 5gbps. Even a single shared 5gbps USB 3.0 setup running across three or four ports, seems like it would work fine; and leave enough room for a 5K display. HDMI 2.0 supports 18gbps; or less than half of the speed of Thunderbolt 3, and supports up to 4k. 5k is a LOT more pixels than 4k, I realize that; but I was just under the assumption that it could still work.
But I'll stand by the criticism that if they cannot support Thunderbolt or USB 3.0 through USB-C, than the better option is USB 2.0 USB-A ports. Ethernet would be nice, too, if even 1gbps could be spared.
It's really a function of how the pin assignments work out on the usb-c connector. There is an extensive thread on this in the MacBook forum where there is even a hack you can apply to get 4k/60hz off the retina MacBook at the cost of your usb speed dropping to usb-2.