Besides the fact that it's misleading when expressed that way, that 40% multiplier isn't comparable to other modifiers. For example, going double Apocalypse sacrifices a 20% HP boost you could've gotten from Crom. And what do you get in return? About a 7% damage boost. That's why I didn't find your example all that useful to answering the question at the center of the discussion: using what we know about the damage formulas to recommend what eidolons (new) players should be investing in and using.