Ehm... that is how it works on Blackrock too.
I am not here to defend Dev and Q&A works but the fact they have not fixed it even tho reports has 50 vote does not make you understand they do not consider it a bug?
They are just waiting for someone to show a solid proof there were no minimum range during 3.3.5a.
The fact a Dev from Blizzard said "his was an unintended change as a result of a bug trying to fix something else. Death Grip won't change between 3.3.2 and 3.3.3." does not mean there has not been a change on 3.3.5 or 3.3.5a
Anyway within just 30 sec on YT I could find this video from retail:
https://youtu.be/BYK6OkFwbv8?t=4m16s At 4:18 DK presses Death Grip > nothing happens > "Target too close" at center of sceen
Video description: (This video was recorded before patch 4.0.1).
So the point of my post is that you need to find a video from Retail 3.3.5a (so, uploaded 7 years ago) where a DK successfully uses Death Grip on melee range.
I am trying to do it by my own, I have already watched more than 7 Videos, but it is not easy