Is the reasoning book no longer in use ?
Just like the "7000 year creative days", the Reasoning Book has simply faded out of existence, never to be heard from again.
Or, using another analogy, rather like Soviet party members who fell out of favor with Stalin. Just <poof>, no announcement, no nothing, just one day, they aren't there & aren't mentioned any more.
Come to think of it, there have been a few 'big' books that have ''faded'' away over time.
Aid to Bible Understanding.
My Book of Bible Stories(I could be mistaken here, just don't see or hear of it anymore)
I feel quite sentimental about the end of the Reasoning book. It helped me on my way out. I decided to work my way alphabetically through the topics in the book and research other points of view. By the end I realised that there was barely a single topic where I could agree with the Reasoning Book's reasoning, or lack there of. What struck me is/was how very simple and black and white all the teachings are.