Yes, but that adds more cost. I don't have any hard data on this, but it feels like their current solution works fine, since anyone using more data than 2160p60, who also won't accept chroma subsampling, probably is already using DP. Maybe this is a direction to pressure the HDMI forum, since unlike AMD, valve's drivers are actually open source on the majority of their users' machines. And if things change in the future, external adapters or proprietary adapters are both solutions.