Why some Book reference requests are closed and some are not?
I've seen again and again how some questions that ask for a suggestion of several possible options are closed, while others remain open and are highly upvoted.
What book/resources/tools/etc would you recomend for the X professional?
are most likely to remain open, and highly upvoted
While questions like:
Books/resources/tools that every X professional would read/have
are most likely to be closed as non constructive
It seems to me that the two questions serve the same purpose, that is, to get a
comprehensible list of highly recomended resources that the X profesional could consider for certain activity.