The essential problem is that you can only have one directory entry for each user. Most directories start out clumped, and then move towards lumped as as the problems of dealing with people that work at two sites, or people who are both staff and students, etc get too hard to handle sanely. So rather counter-intuitively, larger directories tend to be lumped.
You end up with a similar progression of thought with user IDs, the nirvana for operators of huge directories being an ID of six random non-vowel letters with no real-world relevance whatsoever. If someone gets married, you don't want to care. If there's a new regulation concerning the publication of student IDs, you don't want to care.
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