I haven't reinstalled Windows since 2019. Sounds like a user mistake. My IT teacher always said that the mistake is always between the screen and the chair.
Many companies have many old PCs that haven't been reinstalled for ages.
It's not true, I'm a pro Windows user to this day - my everyday work as an admin (and a Mac user at home) and for years it was the same for me. After about 6 months of use a Windows machine would slow down and begin to become annoyingly unusable and a reinstall would fix that. I have my MacBook Pro from 2020 which has at least 12 major upgrades worth of data in it as I started on Snow Leopard and its as blisteringly fast today as it was on my initial MBP. On the Windows side I don't know if its bit rot, and NTFS's inefficient organisation of bits on a drive over time, the telemetry collected through data-hoovering which has an impact on the CPU, RAM and drives, (which nobody wnats) or updates that come with fairly large performance penalties, or the fact that Microsoft doesn't make a basic range of decent quality applications out of the box unlike Mac, and so users install and try multiple types from 3rd parties that fill up the machine with crap, and run services and may contain adware and PUP's which all result in having an impact.
The Layer 8 problem (its the users fault) is the worst excuse, when we consider that people comes from multiple different levels of experience, the platforms and software we use are imperfect (poorly designed, inconsistent UIs, often buggy, designed by techs for techs, not everyday people), manipulative (data-sucking, read this 24 page legal contract, don't understand it and then click Accept) and old and in need of a rewrite (the NT kernel which remains in place just to keep old corporations happy and compatible). We then blame the new user for not knowing all of the above and not being an expert from the outset? How ridiculous is that. Imagine you're put in a cockpit of a plane and expected to land it only knowing that the hand thing to the laft turns it left and right and up and down and the other hand thing controls the engines. Naturally you'd crash into the ground (more than likely). Now, not knowing how to land it, would not make you an idiot - just inexperienced.
What you might find easy today is what might be difficult and frustrating for a new user - but you've forgotten how hard it was at the start and how you were the "problem between the chair and the screen" - you've just forgetten that. It's easy to dump the problem on the user because their lack of experience and education can make them inarticulate and seem stupid - but isn't that the problem of companies to solve as opposed to blame people for their lack of experience and education (which is highly varied across any given population). UI and UX have changed radically in recent years for better ease of use, not because users are "stupid" but because the UI / UX was bad and needs to serve a large and diverse population of people, some of which will be complexity inclined and others which wont be, some of which come from highly educated backgrounds and others that don't (and the statistics show that higher education doesn't actually provide better training for computer use). It's easy to blame the weak individual that can't stand up for themselves because they don't know what they don't know, much harder to look at ourselves from a wider vantage point and find out that we still have the really hard work to do and make PCs and Macs and software easier for everyone - that's way harder.