Posted June 14, 2020

It looks a bit like a "I know it but I won't tell you" mockery, doesn't fit to the depth of detail in other parts of your FAQ.
The Gold Box games also typically support THAC0 some distance above the level caps, and there are ways of getting around those. It doesn't take much hacking to train a fighter to level 18 in Secret of the Silver Blades; that fighter will have better base THAC0 than a level 40 fighter in Pools of Darkness, which suddenly has the level 17 cap rule from 1st Edition.
I left it this way partly because I didn't thoroughly check all of the other AD&D games; people do make decisions for other games not in this series based on what I write.