It punishes B Wings and Y Wings and the generic turrets and Lambdas and Firesprays and the upcoming K Wing and TIE Punisher. These are ships that are based around having crap agility but a lot of hull to make up for it that are pretty much guaranteed to lose health.
I think a TIE Fighter with 1 health on it is worth more than 4 points.
I'd kind of just rather have the status quo than partial scoring honestly. I mean yeah, anything that sucks the fun out of being a Turretwing player I'm game for, but we can't take a bunch of other stuff down with super turrets.