You are ascribing an extreme personality to these people while criticizing the other extreme and I'm saying that the most reasonable thing is somewhere in the middle; just help the man with what he intends to do.
I’m trying to stop him from wasting his time. If he wants to make a repository to help the world at large, that is a fantastic idea because there is someone who will read it. But if he wants to do this specifically with regards to passing on information to his juniors, he should just actually train/teach them. If they are receptive to the info they will ask questions. If they aren’t, no amount of cataloguing will change that. That was my whole point. The dude is clearly looking for a project and is barking up a tree that is gonna make him feel useless.
Okay, that is a fair take, in the end it will depend on the student what kind of teaching methodology will work best but it is indeed unlikely that they will gain more from him trying to write a book than him sitting down with them.
Maybe with that as a baseline understanding the next interpretation of his question becomes: where can I find others in a similar predicament so that we can collaborate on building the book (as I gain experience coaching these juniors and need support network when I am flummoxed)?