Joe probably cares about Metro, though, which is a far more significant piece here.
And let's not kid ourselves; Microsoft is catching the attention of developers mainly in order to extract money from them once they lock in to the Microsoft ecosystem. It may or may not be a Bad Thing, but it's not doing any favors to the Node or Git communities that they'd like us to think they care about.
Well, you could always speculate about intentions, but supporting open source tools seems like a step in the right direction. The community usually benefits from more popularity, and open source licenses offer some level of protection from "embrace and extend".
And let's not kid ourselves; Microsoft is catching the attention of developers mainly in order to extract money from them once they lock in to the Microsoft ecosystem. It may or may not be a Bad Thing, but it's not doing any favors to the Node or Git communities that they'd like us to think they care about.