I believe the issues is viruses. Malicious people are more than willing to exploit any opening they can. Microsoft has moved on and won't fix any newly found security risks on old platforms.What support would you need if the computer works? I don't think I've contacted Microsoft support in the last 20 years. And there are many people still using XP. How do they manage?
You're probably fine. Just don't put any credit cards, home address info, etc onto this machine. Maybe all that data is fine, if contained inside the web browser only? I'm not sure what security Chrome Edge etc have for preventing data from being stolen.