It was one example, and if you'll notice I said "or just any affordable windows machine," I don't know why you're ignoring that.
As for the 2017 releases getting less than 5 years support, I have never heard of this nor am I finding any examples. Here is the Monterey (apple's current OS version) compatibility list, which consists of computers as far back as 2013. So I'd be curious to see what you're referencing. Catalina, the previous OS which dates back even further with compatibility, had security updates until about 8mo ago as well.
3 years is unacceptable on Google's part and Apple hasn't come anywhere close to that.