For me as a reader of LotR there is no difference. I can't tell what editing he went through just by reading. I learn that stuff by reading critical editions, Thomas Shippey's book, etc.There is a difference between Tolkien sitting down and developing a world in his head, then putting it into prose so he can communicate that world versus him making it all up as he writes
I any event this seem irrelevant to the post that you quoted. As I said, "No one can explore the contents of someone else's imagination unless that other person tells them. Communicates and tells are synonyms in this context." JRRT can make it up and then write it down, and then tell me. Or JRRT can tell me as he makes it up. Either way, he is telling me what he made up.
Do you think I don't know this?my he difference in an rpg is it is interactive. You are not simply being told things
But what does the interaction consist in? Who says what to whom? And what effects does that have on who imagines what?
If the players are exploring the GM's mental model of the gameworld, how do they do that except by saying things that prompt the GM to tell them stuff about what s/he is imagining?