Well, I'm not going to dig through old modules to prove my point. And, who knows. Maybe I'm remembering incorrectly. It was a long time ago. But, in the early AD&D years, I do remember interesting uses of dice for things--obstacles in adventures. A roll to climb up a mountain (not using the Thieving skill, but for the whole party).
You are remembering house rules (whether dropped into a module or a campaign) not RAW. Hence, my original comment.