Sorry for resurrecting old thread.
For me, advantage of USB-C is ability to use 1 cable to transfer data, video, and power to/from device. I don’t know however how much (re-)work of motherboard would it require, and how would it influence existing ports - HDMI, Ethernet, and ability to exchange CPU boards.
I like the current situation - ability to power Reform with 9-32V (see discussion about using adapters to power Reform from USB-C PD), and HDMI which is (at least currently) more popular in monitors.
I have Purism Librem 13 laptop which has one simple USB-C port (only data, with neither power nor video) and I’m not using it often. Of course if there would be new motherboard USB-C port providing full-functionality (data, video, and power), I would be all for it. But as far as only adding data port - IMO it’s not worth the effort.