The problem is that relic ballances it on boolean value. This means it is impossible to go in between. Flak units can either damage one model or all models in building at the same time. That means all flak weapons take from 4 to 6 times more time to kill a squad in building now than before the patch. And is just as big of a nerf at it seems to be. I dont really know how to ballance this.
anyway. it's overnerf. i think.