Comment by hansvm

At one SaaS I worked at, I spent a day or two on a foolhardy initiative to analyze our users based on the subset of features they actively used (hoping to reign in the complexity of the product to a few core archetypes we could design for, ideally eliminating some of the more annoying features on the way). The results weren't any better than a weighted random choice. Beyond the login page (and even that had a few customization options), every single person really did have a different 20% they cared about.