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You categorize the npubs, in order to determine what will be included in the list displayed. You also can do other things with the categorization, like batch-DM or batch-invite everyone under "best frens" or "community ABC", or have your personal algo shuffle the order of categories you see in your feed, or prioritize the order or change the formatting, according to category, or create custom feed DVMs, or etc. Follow is binary follow/unfollow, whereas categories are circa 2000 possibilities, limited only by the size of the category event, and most clients will probably have some defaults, like "following" or "friends" or "contacts" or "must read" or "expert" or...