Why is it certain skills/spells effects are not readily apparent to the players from Helpfiles?

Example: I've heard svirfs dual-wielding axes get a flourintine-like affect to their tanking. Is this true? If so, why isn't it in the helpfiles?

I guess I just wish there was less vague and more skill x gives +9 damroll. Any chance for this to happen, or logic on why it doesn't?