Yeah I understand what you mean that a person's approach to bettering themselves is important and would be fairly transparent after knowing them for a while.
It's interesting to go back to a book you think you know because there's definitely things that you miss the first times you read it.
Oh yes! It happened to me. We mature and sometimes our mind is not ready for the book at the exact time. That is why I value physical books, I can always return to it and read it again and again