so far it sound like cool will be the stat for shooting (= the most important for solos, if not for all classes since the FPS elements are very strong in this game).
I thought cool would've been one of those stats that give you random buffs like "luck" in fallout (= totally ignored by me), man, I was wrong.
It was said that you can practice every weapon type by using it/on practice ranges, so the handling of the weapon, aiming and reloading becomes easier. It will be shown even in the animations of the character. So it's not only about cool.