I have a colleague that insists on using pen and paper. He has draws and draws full of random scraps of paper which apparently have important things on them.

He's even gone out and got expensive paper which is apparently made from stones? and is there for waterproof, It does appear to be waterproof but I'm not convinced it's made out of stone. He has a phone and a Laptop, and an iPad Pro with a stylus, and he refuses to use any of them.