Your observation in many ways can be extended to the Microsoft ecosystem as a whole. Microsoft as a company has always had this weird thing where the materials

Your observation in many ways can be extended to the Microsoft ecosystem as a whole. Microsoft as a company has always had this weird thing where the materials they release (marketing, documentation) are written in an alternative universe where no non-Microsoft technology exists. I haven't been part of the MS ecosystem for a number of years but I do get the sense this has been changing. But in many ways I don't think it's a deliberate framing, it's likely just as much due to the reality that inside of the Redmond/Bellevue bubble, things like Ruby on Rails, the iPhone, and non-IE browsers are weird, untrusted 3rd party technologies that nobody uses (partly because they think Microsoft products by definition are better, partly because they fear if word gets out they are toying with these things there will be negative consequences.) I remember when C# was originally released the degree to which Microsoft managed to pretend like Java did not exist was just plain bizarre. I guess one way to look at it is Microsoft is a good counterweight to the argument you should eat your own dogfood. You should, but you should not do so exclusively.