Speaking of people using odd input devices, whenever I'm playing CS and someone says "sorry I'm using a trackpad right now" I get as mad as Jim Jackson when someone passes the puck to a wide open teammate instead of taking a bad angle shot, against a ready goalie, with three players in front of them.
@JojoTheWhale can confirm that I was using a trackpad the first several months I was playing Path of Exile. It was ... not easy. Especially when you pick up thousands and thousands of scrolls.