That’s true, but this kind of balancing will need readjustment of Skills and Runes too. Let’s look how D4 will work. If you would balance skill and runes, LoD would work for all classes and sets could be balanced easier.
Dh is not the only class that benefits from this. I was playing around with creating some LoD build for a monk using a combo of shard of Hate and cold attacks. I also had that hand weapon that bumps LTK significantly and notice while firing LTK into a missile dampening zone…it had the same effect as HA.It keeps doing damage as long as the attack and bad guy images collide.
It may also be the same with the DH impale with overpenetrate.
My guess would be any attack which has a piercing probability triggers this issue…Its just that HA is so blatantly obvious graphically that makes it more noted.
Yes, there are other skills, even from other classes, that will keep colliding with an enemy over and over when combined with missle dampening. The issue with HA on DH is the rune that keeps increasing the damage of the arrow everytime it pierces with no limit to the gained damage bonus. Think of it as bane of the stricken on crack.