The tool tip could be greatly enhanced if they explained to the player what next level attack speed they need to get to the next attack per second. The existing tooltip already tells the player what the current attack per second is, and this would bring better clarity just like their updates to armor cap tool tips.
I think it’s perfectly reasonable for the average gamer to assume that because movement speed affix incrementally makes the character move faster that this is the same way attack speed would work in the game as well – even though it doesn’t.