While this Windows feature does sound quite bonkers as described, it is also baffling to me that the timekeeping on computers is such a mess; would it really be that difficult to have my multithousand dollar computer keep time at least as well as a dollar-store quartz watch? Have time already set in factory, and be correct to within few hours at least; enough to do networking and more accurate time syncing safely.
Computers have a lot more temperature variations than a typical quartz watch. In the absence of temperature correction, they'll be less accurate.
This shouldn't be overkill for a server dedicated to timekeeping on a large company network, right?
In a datacenter one could even go for a matchbox sized atomic clock. Last I checked (years ago) such a miracle device could be had for ~$1500.
Then: how often does atomic clock (or even TXCO) fail, in practice? My guess: only about as often as even the backup power fails.
Note that either should provide accurate timekeeping without even going outside a physical location. That is: without using 'random' NTP server on the internet, GPS or whatever.