What you can do with follows is catogorize follows, but because the categories are abstract, not inherent, you will inevitably have people you can place in multiple categories, so adding hierarchy to a follow list creates redundant list entries (Bob is in the frens, baking, C++ community, and coworker lists, for instance). Which we already see. Npub lists are incredibly redundant because they most active npubs can be categorized n different ways. Anyone worth categorizing is worth categorizing with all sorts of stuff, that's why counting the number of labels people attach to a Kind 0 would be a truer signal about how information-heavy an npub is, than mere follows.