Ok, but, why not just try to converge on one connector? as you say, the world doesn't care...
HDMI world wants DRM because other than Kim Dotcom (who is highly problematic for other reasons) no one has dared to stand up to the MAFIAA goons.
Computing world wants DisplayPort and a hassle-free, high quality experience. DRM breaks that.
Also, since older HDMI was physically compatible with DVI ports, a lot of computers preferred to keep DVI ports...