MLG operates MLG.tv, the #1 online broadcast network for professional level competitive gaming; the MLG Pro Circuit, the longest-running eSports league in North America; and GameBattles, the largest cross platform online gaming tournament system with 9 million registered users across the globe.
Keeping the Surface Connect port and making the Surface Dock compatible with the Surface Pro 3 in the process instead of replacing it with a symmetrical and reversible USB-C port is a tradeoff I posit Microsoft thinks is worthwhile at this stage.
The first is that while the MacBook Pro comes with two Thunderbolt 2 ports, two USB 3.0 ports, an SD card reader and HDMI port, the Surface Book comes with a more limited selection of ports as it lacks the dual Thunderbolt ports and swaps the HDMI port for the Mini DisplayPort standard.