yes, that would do for this use-case I think,
But consider this usecase:
I have 100 books same author / same title / same format / different size.
This books need to be checked if they are the same or not.
Without changing metadata, (other than access-time) I want to know if these books have been checked.
The books are perfectly sorted (so author, title, tags are fine).
If there is a difference between the books (resolution, color, textual, layout) I'm fine with it and want to keep them as they are.
If there is no difference (e.g. size was different because of one book having comments repeated twice) I want to delete the book and not bother any more.
If I could see the last access time, I would know if I did or did not check it already.
(And yes, I can think of more cases that would (at my site) be a good reason to have this field).
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