I finally got around to finishing watching Jeff Schewe's first video on photopxl about processing in Lightroom. He made a passing comment that he often moves an image into Photoshop to finish it, but he made two comments about things that are better on LR/ACR. First, he said that the histogram in Photoshop is very old technology and is inferior to the one in LR/ACR. Second, he said that softproofing is better in LR than in Photoshop.
The latter surprised me. I've always seen the debate about printing from LR and Photoshop couched as an argument about the extent to which LR is as good as Photoshop. This is the first time I recall an expert maintaining that in one respect, LR is superior.