There are lots of great points in Chris Hardie’s Distributed vs. In-Person Teams, an article on the challenges and opportunities of remote work. But this part, in particular, stood out because I’ve experienced it myself:

Having some remote workers is harder than being fully local or fully distributed. […] This dual approach is probably a recipe for disaster when it comes to building shared vision and common culture in an organization. If there are team members who have a daily experience of being in the same space together and sharing all of the quirks and benefits of that, remote workers will almost always feel excluded in some way, culturally, logistically or both. When only part of the team is forced to consider the implications of having a distributed group, an unfair burden falls to the remote worker to keep their needs in front of everyone else. At best it adds a weird kind of tension to team relationships, and without incredible discipline and initiative, it probably won’t work in the long run.

This gets even worse when the remote workers are in different time zones. The remote workers are almost always the ones who have to give up their evenings to do Skype calls.