I did use it more than half a year ago for a few math problems. It was partly to help me getting started and to find out how well it'd go.
ChatGPT was better than I'd thought and was enough to help me find an actually correct solution. But I also noticed that the results got worse and worse to the point of being actual garbage (as it'd have been expected to be).
Arch updates going bad is much more likely to happen if the system goes without updates for a long time. So I'd really not recommend it for a seldomly used laptop.
But regularly updated Arch is fine. Even if something breaks it's usually easy to deal with.