Well - this is just the point. DxO does in a couple of seconds what you have to do manually with LR in about 10 minutes, only the results would probably be not quite as good. Some things you just can't do, even if you are Mr. Adobe himself.
To make my case - just look at the lower right hand corner. The otherwise excellent 24-70 shows some softness at the corners at 24mm. DxO takes this into account by sharpening the soft region of the lens more aggressively. Also, other flaws like lens distortions, CA and vignetting are automatically corrected.
With a high res. camera like the D800 this type of corrections become even more important,especially if you don't have top quality lenses.