Thats why Area effects are OP and still in discussion of balancing it out.
What if there wouldnt be Voidbulbs?
Then you have to use Thunderarrows, Thunderwave, Push etc. = More balanced.
Well my only argument would be that Void bulbs are very limited in supply. You need to grab as many as you can from the Ship but there are no more available - as far as I know.
Not saying they are not OP, but there are lots of OP fights to utilize them on and then you are done.
Thunderarrows are more limited in application because they do the opposite of a void bulb - they are still great fun though and super useful.