Eye contact, Face-to-Face meetings, shared space, white boards. I think next generation VR will be a tipping point for remote work.
https://convergenttechblog.com/2016/12/22/the-microsoft-surp...
Comments here are enlightening:
https://news.ycombinator.com/item?id=13166032
Its a product that finally got almost everything right when it comes to a digital whiteboard. And yes to another point that was raised here certainly integration with Mircosoft services was a plus. Its great to have a computer interface that is remote on half the board and white board interface on the other. You can mock up while you have the specs inches away from your face on a huge screen so everyone in the room can read and interact. The skype integration kills it as well; there's been a number of times I've seen teams huddled around the board mocking things up with one or two people remote.