I don’t know why Windows as a whole is such a piece of fractal shit.
Maybe it is shinnegans like this: https://www.propublica.org/article/microsoft-cloud-fedramp-c...
I've spent much of my life inside Microsoft's ecosystems. Not merely my career, but my technological life itself started with Win 3.11 on a parental laptop. I've spent so long in their orbit that I can generally infer what their latest thing does and how it works from an IT POV based on its product name alone, because I understand how Microsoft thinks from a marketing and engineering perspective.
As you say, they have some truly brilliant folks in their ranks. Those few diamonds are buried under mountains of garbage and slop from above, though. I mean, this is the company who pioneered full-fat PC handhelds 20 years before the Steam Deck, the smart watch a full decade before Apple, the home media ecosystem years before streaming apps dominated, smartphones before the iPhone, I can go on and on. The problem isn't the engineers so much as corporate mismanagement, but they somehow survive like a cockroach based on install size alone.