These may be anti-features, but it is good in a couple of respects. One is the acknowledgement by Microsoft of the role of open source software in the industry

These may be anti-features, but it is good in a couple of respects. One is the acknowledgement by Microsoft of the role of open source software in the industry, and the other is to facilitate the development of software in mixed environments. I seriously doubt this poses a serious risk to open source software. Open source developers are not going to be any more likely to adopt closed components, particularly from a company that has bred animosity towards open source in the past.