There is no such thing as "the user". Users... come in all shapes, sizes, and colors, and they have widely varying information needs.
Hans H WellischDetailed analytical indexing is generally the hallmark of good back-of-the-book indexes.
Hans H WellischImportance, like beauty, is in the eye of the beholder and that there is nothing inherently "logical" about the preference of users in looking for one component rather than another of a compound heading.
Hans H WellischThe indexing problem changes with each new book undertaken. To meet the needs of different classes of seekers and to suit various types of books, rules entirely satisfactory in one case must be varied in the next and perhaps ignored or even reversed for a third... Indexing is a highly complex intellectual process involving the use of language in a specific and somewhat artificial way, and that it is also to a considerable extent a matter of intuition, the workings of which cannot be reduced to fixed rules. It is 'knowing what but not knowing how'.
Hans H Wellisch