That's a rather unreasonable criticism. I'm sure if you could ask the author (before he died a few years ago), he could provide you with more detail. Requiring

That's a rather unreasonable criticism. I'm sure if you could ask the author (before he died a few years ago), he could provide you with more detail. Requiring an author to expand on every question a piece brings to the readers' mind is just an unreasonably high bar.