Neonchameleon
Legend
Neonchameleon, I honestly can't take you seriously. Your comments don't reflect my (recent) play of old school D&D whatsoever and sound more like someone who's never actually played the game.
Maybe you were doing it wrong? *shrug*
Nor my recent play. But my old play as a teenager - yes.
And as for recent play, documents like the Old School Primer and blogs like Grognardia are a lot better at explaining intentions than Gygax (let alone the 2e DMG) ever was in print as opposed to in person.
There's a lot in old school D&D to encourage DMs to be jerks. Most grow out of it. And if you're still playing old school D&D you almost certainly have. But the presence of earworms, lurkers above, lurkers below, gusts of wind strong enough to blow out torches, etc. encourages jerk behaviour from DMs. However most people don't put up with DMs like that for decades on end. So the emergent play now has weeded out some of the emergent play at the time.
The rules for climbing in the Moldvay/Cook Expert book , which I assume were repeated in the Mentzer Expert book, any surface the fighter could climb with an ability check, the thief climbed automatically, no roll needed. The thief only had to roll for climbing sheer surfaces or minor overhangs, which the fighter had 0 chance of climbing.
Now this makes sense. Climb Sheer Surface is a very different beast fom Climb Walls. I don't recall there being anything in the AD&D rules saying that you don't roll if you can climb a surface with an ability check.
I'm not sure if the AD&D had rules for non-thieves climbing until the Wilderness and Dungeoneer's survival guide.
Where you don't have rules and it's a reasonable option you default to an attribute check. And if you're using Climb Walls, and have a decent attribute then your chance can be significantly better than the thief's climb check.