Post 1 gives the Op's reason which seems reasonable. I don't use them because they never made much sense (I don't generally need to look up words and the dictionary is not very good so I don't and seldom use TOC.)
But if they worked I would use them to calculate pages per minute. I feel that I read ebooks with reader slower than paper or on computer screen.
Personally I would think dictionary lookup is reading too, because why look up the word if you don't read the definition?
Helen
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