with the current quadratic nature of attack stat -> mob damage...
reducing attack by 20% (aka multiplying it by 4/5ths) will lower the damage by (4/5)^2.
thus the damage is lowered to 16/25ths... lowered by 9/25ths = 36%.
So it's currently better. After big bang it seems it'll lower damage by just *30%. Granted with nearly everything doing less damage due to defense actually making a difference, the lowering of threathen's effectiveness isn't too bad.
*correction thanks to poster below.
reducing attack by 20% (aka multiplying it by 4/5ths) will lower the damage by (4/5)^2.
thus the damage is lowered to 16/25ths... lowered by 9/25ths = 36%.
So it's currently better. After big bang it seems it'll lower damage by just *30%. Granted with nearly everything doing less damage due to defense actually making a difference, the lowering of threathen's effectiveness isn't too bad.
*correction thanks to poster below.

