@White Tie, I agree with ED here. A uniform look of the ME would make a lot of sense in terms of consistency. Why not take the arrange as a good example? The "borders" (toolbar space, empty space, etc..) are here dark as well:
(pardon my real bad drawing and the huge screenshots, but I wanted them "side by side")
https://i.imgur.com/IdFzN1q.png
So, wouldn't it make sense (as mentioned, in terms of consistency) to have a smiliar pattern with the ME?
https://i.imgur.com/BIm3RNU.png