I think Windows has gotten too complex for MS to understand. Shadow directories and fake redirections and everything dependent not on the OS or the File System, but the Registry, may just be a step too far.
What's actually happened is described pretty well in this article - basically they laid off a load of traditional QA and testing professionals in 2014 and are now relying on some sort of crowdsourced bullshit for QA, using people who are on the beta releases, i.e.e fanboys.
https://www.theregister.co.uk/2018/10/23/microsoft_windows_10_crisis/