Makes every ability without overpowered damage effectively useless.
Welcome to what Mythic learned in regards to flat damage nerfs to AOE's in Warhammer Online to combat the fact that one subset of classes had insane damage (Bright Wizards/Sorcs)
The only thing that happened was the other DPS with aoes, Engineers/Magnus/Squig/Shadow Warriors now had subpar AOE damage that couldn't kill squat for a very long time.
Blanket nerfs to damage do not work...They've never worked...If there is a problem with damage on certain abilities, You have to actually adjust those abilities...1 Size Fits all does not work in terms of balance..It never has and never will.