Remathilis
Legend
In theory, I agree. NPCs can have class levels and high ability scores like PCs, regardless of edition. The vast majority of them won't though.Non-adventurers generally learn more slowly, but they potentially have access to all the same stuff. I still prefer that adventurers learn more slowly than the modern D&D assumption though. Really breaks my sense of realism.
In AD&D, the number of paladins is vanishingly small. Being born with a 17 Charisma is freakishly rare. Any PC paladin, even a level 1 squire, is already a superhero just by existing. The same is true of rangers, druids and bards. The law of averages says a druid's 15 charisma requirement should make druids so rare that there shouldn't be enough of them to form an enclave, let alone fight for rank.
Almost every classed character in D&D should be on par with a Marvel Superhero in terms of notoriety. The Core Four, with their 9 Prime requisite, might be common enough to slip by with little notice, but all those other classes that require 15 or higher ability scores should be at the very least locally known. A village should know a ranger exists in the woods or have heard tales of a local bard. And that is doubly true of PCs who get into all sorts of shenanigans.