Therein lies the rub, or lies the lie to be exact, a 38-year old+ lie: Windows was never an operating system (neither is MacOS for that matter). The system worthy of that name, operating system, is only a type 1 hypervisor (such as Xen because open source), where you truly operate over the system(s): any issue with some weird quirk in a machine? nuke it from orbit and spin another one.
Your Adobe Photoshop application has nothing to do with your Fortnite game, and both of them have nothing to do with your browser and your propensity for tabloids: they should have never been and should never be on and under the same "operating system", perhaps not even on the same disk. Isn't it insane that we must sometime restart the operating system with all the apps because some single app crashed? How could this system design ever use the name "operating system"?
The only benefit of cohesion is the corporate benefit: the system, and hence you, your data, your consumption patterns, are easier to manage if they are under one "operating system". And you, the faceless, nameless, general you, because you don't actually care about your data, about your attention, and perhaps not even about your life, oppressed as you are into being choiceless, hence powerless, deserve "operating systems" such as Windows, MacOS, and companies such as Microsoft, Apple, Google, Amazon, and nowadays "Open"AI.