Strangely enough that is the state of play a few years back - when MSDN and Technet really described everything, and did it really well.
Nowadays, there's so much crap on there, mainly caused by Microsoft changing the format every year, but also adding so much new product and new incompatible versions, that the documentation isn't nearly as good as it used to be.
I remember the days when you could buy a 5-volume Windows NT manual that was awesome. Not any more.
On the other hand, take the documentation from someone like RedHat, that is really good, all-in-one and very comprehensive, just like the old days of Windows.
I think part of the problem is that Linux can have many "3rd party" features added to it, so when you step away from what RH ships, then you're on your own, but everyone assumes that it should have the same level of documentation.