Well, a variant of that is pretty common, Rye. To follow the right hand rule (which is important in mechanics, physics, and 3d cal), your x would have to go to the left.

(in our physics tests, if you stood at the bottom of the amphitheater, you could see all these students holding out their right hands, but some are holding their pencils in their right hands, and try to use their left, then scratch their heads wondering what's wrong)

basically this was just an arbitrary choice that was made so that things like magnetism making electrical current, forces away from a center of gravity making a moment, etc consistent!