Microsoft has responded to a change.org petition that was created to ask that old Xbox One policies that were announced during E3 would return. In an interview with IGN, Marc Whitten said the following when asked about features, like family sharing, and why Xbox One is removing them.
We took some feedback and realized there was some stuff we needed to add to the program. To add it to the program, we had to make room, just from a pure engineering perspective, to be able to get that work done. So taking Family Sharing out of the launch window was not about ‘we’re going to take our toys and go home’ or something like that. It was just sort of the logistics of ‘how do we get this very, very clear request that people really want, that choice, and how do we make sure we can do an excellent job of that, get to launch, and then be able to build a bunch of great features
On Subject of Family Sharing:
If it’s something that people are really excited about and want, we’re going to make sure that we find the right way to bring it back,” Whitten said. “A ‘road map’ sort of implies more like ‘on date X it’s back’ than I think exists, but we believe really strongly in how you build a great experience on Xbox One for me as an individual, but also for my family. Family Sharing is a great example of how you do that with content. I think you’re going to see us, both with examples like that and with other things, keep pushing on how that’s something great.