They don't always attack when asked and part of that is people spamming to the point where you get numb to it.

For me, if I am not attacking it is because I need hp, need to fallback, can't attack do to cc. There is almost never a situation where there is nothing to attack unless you are on the other side of the map alone trying to refill your hp or the other party is dead, or chasing strays away from crystal.