If you’re not doing stuff with them; not much point.

Since these devices have ARM processors, they can be embedded to places that doesn’t need high power and contain smaller volume; unlike PCs. You can host your a Jellyfin server on one, host a pi-hole so that you filter out every internet traffic from ads on another. Maybe a small FTP server that you can use as cloud storage?

Math knowledge is not essential; but really useful in programming as you’re trying to make the computer do calculations of some sort.

Someone could definitely be too dumb to code though.