> there people that use the caps lock key?

Yes, of course. Because I programmed my Keychron for it to be a regular LShift. Works very good for my hands. But when I'm on the regular keyboard I have a real trouble with typing or entering passwords, but it's manageable.

> Cant remember using a function key

I use it for the volume control when I'm in a fullscreen app or with both hands on the keyboard - but only because my Fn is on the right and volume controls on F10-F12.