Yes HDMI forum are shitbags, but there are definitely technical advantages to HDMI. Just that I can think of, DisplayPort doesn’t have ARC (audio return for sound systems), or CEC (device can turn on TV/display, TV remote can pause movie playing on console, etc) and the max length for a DisplayPort cable is no more than 3 meters before you have to go to expensive active cables. Most of these are easy to work around for most PC setups, but if Valve wants the gabecube to easily fit into living room/TV setups, it does present a challenge.