The advice I'm following is specifically targeted to those self publishing who have not yet built up that audience.
But the advice assumes you want to write formulaic fiction. Not everyone does. Advice to authors should take into account their goals, not seek to impose them. If a new writer wants to write by formula, then teach them how to do it. If they don't want to write by formula, then help them become more effective writers within the boundaries of their own approach. If they don't know, giving advice that pushes them toward formula writing isn't helpful.