I think you are close - but the real thing is that Microsoft has a piss-poor architecture, has interpenetrated one product into another, has hidden side effects, and lots of undocumented features that people have come to rely upon.

They, for competitive advantage, deliberately abandoned every known process for intelligent software engineering. It is a tribute to them that they got as far as they did, freighted with millstones as they are.

Now, what do they do?