In my mind, the biggest feature of the scene tab: The ability to group items, make them unselectable / invisible with a single click. Group up the background elements, then just turn invisible and unselectable in screen for session until you need to do anything with it.
DS has a seperate surface tab, but when I was talking about the MAT I meant the MAT poses, which in Poser land, the PA's would stick under Materials or under Poses willy nilly. In DS land, for conformers the MAT poses are almost universally within a sub folder of the conformer. No more digging through the Library > Mat Poses nonsense anymore.
Now for characters, they were putting official DS figures mats under Materials but the PA's were putting them under characters. For generation 8 it is all under characters now.
All of this, is functionality beyond the real reason I quite Poser, little to no bugs or random crashes. I know a ton of folks were like, just use Poser 2014 instead of P11... Well... You could use DS and not worry about 1/10th of the bugs I would encounter whilst using Poser. Arguably, it seems like no one on the Poser side would put in tickets but instead bitch on Renderosity. Daz actually does things with trouble tickets.
Now if could only sell my two p11 licenses and 3 octane licenses...