Microsoft has been relying on Github to share all of its UWP samples for the last few years. This year, they added all their developer docs to Github so they can be directly addressed and updated by the community. They've done a good job of responding to PRs and issues. I write Hololens software and I could not have achieved such rapid development without their examples and developer outreach.

However, Github is one of my favorite services, professionally and for hobbies, and I really don't want significant changes. I also use VSTS (Microsoft's code+PM online service) and it is a beast. They don't need to be heavily intermingled.