Re: Documentation takes effort ...
MS know very well exactly what each change in their operating system is. And it will be documented in their internal source code control system (SCCS). The SCCS will handle several different branches of development, all documented.
Yes, it's massive and probably hard to overview, but it sure as heck isn't undocumented and chaotic.
Whatever change tracking ducumentation the consumer sees (which is nothing at the moment) has little to no connection with what MS has documented internally.