Uh, wut?
I don't understand this. I can break out my WOG or old modules, and I can assure you that named NPCs have classes and abilities. Because of the simplified nature of things (that you don't have ability scores as saves), they might not bother with the abilities ... but they had them.
Am I missing something?
What I mean is, if you open your book to the stat blocks of the named NPCs, they were clearly not generated using the same rules PCs are expected to use-- their ability scores are ridiculous, and if your character needs to have a couple of 6s in something to be "believable" and "interesting", clearly nobody who has designed these characters for TSR or WotC gives a damn about whether their characters are believable or interesting.
25 point buy +1 to one ability per 4 class levels doesn't qualify you to be a crossing guard in the Forgotten Realms.