What's the actual attack surface for an outdated home PC? My understanding is the threat to win PCs is 50% you clicked the wrong link (outdated browser problem,

What's the actual attack surface for an outdated home PC? My understanding is the threat to win PCs is 50% you clicked the wrong link (outdated browser problem, not OS) and 50% lateral move (probably not meaningful in a home environment?). Like if I plugged my Windows 7 laptop, last updated 2018 into my network, what would happen? What I'm getting at is "instead of throwing out your old PC you can install Linux" is just a long winded way of saying "throw out your old PC" for many people. I think "here's how to keep running an old PC safely" would be more useful advice.