Earlier quoted context omitted.
The big reason we do this is that being a DM, it's REALLY hard to predict what your players are going to do. I used to spend days preparing for a game, only to have the party turn around and wander out of the dungeon 10 minutes into the session, negating all my prep. This way, I can just throw up a map and have them dungeon crawl. I suppose it make a difference that we are playing Rappan Attuk and not a mainline D&D…
I don’t understand how dungeon crawling really felt fun for people. Or random encounters. It just doesn’t seem like a good system for fighting for fun. I always hear the cursed phrase “I guess I attack?” And that’s how I know the fight kind of sucks.
In the 70’s, that space was much less populated, so pencil and paper RPGs might have been the best small tactical games people could get their hands on (not everybody wanted to sell their houses for Warhammer miniatures).