Telling an alcoholic who knows they are one and is trying to recover to “stop drinking” is probably useless. There are numerous alcoholics who are some combination of unaware or in denial and for whom that advice is not (necessarily) useless.
Yeah, being unaware of your alcoholism doesn't make it any less influential on your behavior. If anything, telling someone who is in denial about their alcoholism to "stop drinking" seems like the most useless option.