Ah, but see, you and others keep telling me that the actual scores shouldn't count. That the player should be able to play whatever they want without any mechanical references.
I'm not of that opinion. If you are playing a low Int character and consider yourself to be significantly more intelligent than the character, then you should feel free to correct down. If you have average Int in character and aren't Mensa-level IRL, there is in my opinion no need to adjust.
That is, I think the difference has to be pretty large before adjusting makes sense, much less becomes something I'd enforce.
Yet, even you have a problem thinking that an average individual has a 10 Str or Con.
No, I know an average human in the game world has Str/Con 10, because that's the definition. That just has nothing to do with real world Str/Con.
Now you see where I'm coming from. I don't buy that that character with a 10 Cha and no actual social skills has any real chance of success in difficult social encounters.
No I don't, actually. I see what you are saying, but I don't quite get it. (Sorry, may well be my fault.)
Do you mean: 1) that characters with average Cha shouldn't be able to succeed in difficult social encounters, 2) that according to some rules they don't, or 3) that a real-world average Cha person doesn't?
If the first, fine, that's your opinion and there's nothing much to discuss. If the second, ok, which rules and and could you give an example? If the third, that has nothing to do with Cha 10, since that isn't (doesn't have to be) the real world average.