The Help Center's page about what can be asked here has a list of types questions that are not allowed, even if they fall into one of the things that are considered on-topic here:
Some questions, even if they appear to fit into one of the above
categories, may still be off-topic or a poor fit for this format:
- explaining, writing or debugging code
- providing support for tools or products
- finding or recommending products or services, including tools, libraries or packages, programming languages, books, scholarly papers,
tutorials, articles, or blogs
- career or education advice
- legal advice or aid
That links to a Meta post that explains in great detail why recommendation or list questions don't fit into the Q&A format well. The Meta question that you link to is listed as related reading in that post. Both answers in the question you found indicate that book recommendation questions are not a good fit.
The question was deleted on the advice of Shog9, one of the Stack Exchange CMs, in The Whiteboard, our site's chatroom:
Same way we do it on MSE every day: delete everything that's blatantly off-topic as soon as it appears.
Although this was specifically in response to code dumps, we have had specific problems with five particular types of questions: explaining/debugging code, support for products/tools, recommendations, career or education advice, and legal advice or aid. These are the five off-topic questions specifically called out in the Help Center as not belonging here. If I cannot migrate questions in these types to a more appropriate site, I close using the appropriate off-topic reason and immediately delete. By deleting them, they don't show up in searches and people generally can't browse to them and think that they belong here. Many people don't understand that questions that are on-hold or closed mean that they shouldn't be asked here, so getting rid of them entirely helps present a better picture of what's acceptable to ask in the future.