The problem is that the older OS ARE broken, in a number of ways, and have a range of security vulnerabilities - these can be mitigated to some extent by avoiding the more dubious sites on the internet, but there's always the risk that an otherwise genuine site will serve up a malicious link via a 3rd party advert, or that you will click on a link in a phishing email.must admit - I stayed on Win 3.1 until WinXP until Win 7, then to Win 10, it was always my own hardware upgrades that drove the Win updates for me, old IT engineers adage - if it ain't broke, don't fix it - cant see me changing from Win 10 in any rush !
There are obviously still vulnerabilities in Win 11, it's just that with each major release the OS gets locked down a bit more - an unfortunately MS also add a bit more lock in (and some crazy 'features' that no-one wants).
I'm was using Win XP for one of my work machines until 3-4 years ago, but that was maintenance work for an end-of-line product which had a Win XP PC built in which would (should) have only been on a secure internal LAN.
I now use a mix of Win 10 and 11 machines, my old PC is Win 10 and can't upgrade (replacement due, as it was originally a Win 7 machine!), while my personal and wok laptops are both Win 11.
