Misinterpreting for fun and profit
Where do you read "poor record"? I didn't say that. I said "The chief NT guy hates Unix". Which is true and well-known. This has nothing to do with mettle.
Now that you mention it, yes, I would argue that main problem of the windows architecture is that no such thing actually exists. But it would be besides the point, for it isn't needed to see why redmond is unlikely to do anything resembling what apple did underpinning macos with darwin.
But then, you're not interested in making useful comparisons. Desktop share is not a fair measurement of OS design quality. It's more of a measure of network effect and inertia. Recall that the XP share of windows installs is still around 66%. Server share isn't either, not straight-up, and worse, is open to interpretation.
Lifting some numbers from wikipedia here. For IDC claims the "windows" share of servers, in units, is 75-odd%. But in revenue, it's just shy of 50%. With a 23-odd% "linux" revenue. Note that the majority of linux installations, being free distributions, don't contribute revenue to that number. In fact, pitching some netcraft numbers against that: 42% windows, in units, against 41% linux. but W3Techs, checking the top 1mio web servers, found 34% windows and 64% linux. What does that tell us? Windows for servers is apparently overpriced, needs more units to do the same work, and is more likely to be found serving less busy websites or doing non-public server-y things.
And that makes perfect sense. Because if you need your servers to do Real Work you can afford the Professionals to run them properly and if you have any clue, you don't saddle them with windows. That's before realising that running windows on a public-facing server is a disaster waiting to happen. Running the eyecandy for a desktop is a different kettle of fish than running a server. And that again is quite different from running a serverfarm.
Or a super. Go ahead and look up what the OS distribution in the HPC top500 is. When did micros~1 even deign to enter that market? When they needed marketing for their cloud initiatives. Apparently even among the top500 there are some suckers for a redmondian salespitch.
But all this, as mentioned, is pretty much entirely besides the point. Even if Dave Cutler didn't hate Unix, micros~1 is too married to their belief in the superiority of their "contributions to improve other people's lives" and the resulting NIH syndrome that they'd never "pull an apple" with their ToyOS.