A better analogy is alcoholics who go completely sober. You could argue that it's merely a matter of self-discipline to just have one drink and not get hammered

A better analogy is alcoholics who go completely sober. You could argue that it's merely a matter of self-discipline to just have one drink and not get hammered, but... if it's easier to just stop drinking altogether, what's wrong with that? Quitting the internet on your phone is much the same. It's no merely a matter of discipline, it's a matter of addiction.