Earlier quoted context omitted.
No computer that is not getting security hotfixes is "just as good" as it was when it was getting those updates.
Yes it is. Those updates have been applied to it. It does not magically get worse simply because time passes. It does literally everything it did when I bought it and then some because new software came out after it was purchased. Just because it can't run everything else that's come out since then doesn't magically make it stop doing what it's already been able to do.
It quite literally does not.
In 2008, I would have felt comfortable running a Snow Leopard machine with Web Sharing enabled accessible over WAN. Then I could throw whatever I wanted into the ~/Sites folder and access it anywhere.
In 2018 I wouldn't dare do this because Snow Leopard's apache is outdated and vulnerable.