> Note taking for long term retrieval doesn't make sense in a world of internet and machine learning. In the future, you will just enter a question in a text box and algorithms will search inside billions of documents, deduce facts and write an essay to answer your question.

That is a narrow view of the reasons people take notes on books. One might want to save one's personal impressions of a piece of fiction, ideas about superficially unrelated concepts that suggest themselves, etc.