400mg a day, for a healty person, is drug abuse. One can get a better-than-coffee effects from 25mg, actually lower than the recommended dose. And why would anyone take it every day?

But the author is abusing modafinil, and that is problematic. It's like an alcoholic saying "Alcohol is evil because if you have 16 drinks a day your life falls apart and your liver gives out."

It's true in some contexts!