Security researchers Troy Hunt, writing on his blog: Often, the updates these products deliver patch some pretty nasty security flaws. If you had any version of Windows since Vista running the default Windows Update, you would have had the critical Microsoft Security Bulletin known as "MS17-010" pushed down to your PC and automatically installed. Without doing a thing, when WannaCry came along almost 2 months later, the machine was protected because the exploit it targeted had already been patched. It's because of this essential protection provided by automatic updates that those advocating for disabling the process are being labelled the IT equivalents of anti-vaxxers and whilst I don't fully agree with real world analogies like this, you can certainly see where they're coming from. As with vaccinations, patches protect the host from nasty things that the vast majority of people simply don't understand. This is how consumer software these days should be: self-updating with zero input required from the user. As soon as they're required to do something, it'll be neglected which is why Windows Update is so critical.