Originally Posted by burningrave101
Because with HDMI you can connect something other than just a desktop to the monitor and when you're spending $3500-$4000 on a 4K monitor there's no reason not to have multiple input options instead of being tied to just one available input like Apple does with their Thunderbolt connection. I use my monitor for both PC gaming and console gaming on the PS3 and that's something a lot of pro gamers do as well because a smaller PC monitor is far more ideal than gaming on a 40"+ HDTV when your gaming competitively.
I see your point, but more specifically the issue comes from ONLY having HDMI/DVI on the monitor rather than having both DP and HDMI/DVI. I will note, though, that Thunderbolt is pinned exactly the same as mini-DisplayPort, and not by coincidence; you can use DP cables and cards if you want to.