I usually read novels and occasionally use X-Ray to remind me of who a particular character, who hasn't been mentioned in 55 pages, might be. It gives me a quote from the last paragraph the character was in. If that doesn't do it I can open X-Ray and see all appearances of the character.
I don't use it often but it's handy at times. I can see where it would be useless in a non-fiction book, full of names of real people that appear once or twice, such as the driver of the bus that ordered Rosa Parks off the bus.
I wonder if anyone reading wondered who Franklin Delano Roosevelt was?
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