I live in Canada. My dad is religious about the Robertson screw. So much so that I've seen him bring an item home from the store, systematically remove all of the slot and/or Phillips screws from it and throw them away, and replace them all with the Robertson screw.
When I left home for University, my mom gave me sheets and towels and stuff. My dad gave me three baby food jars, each full of a different sized Robertson screw, and a set of those colour coded screwdrivers.
I still have both the screwdrivers and the jars. I've used most of the screws, replacing weak or stripped ones.
And I discovered the method behind the madness. Whenever I have to take something apart, I have to find both the right sized Robertson screwdriver and whatever type the original screws were. He only needs one.
Smart man, my dad.