Stats, rolls and being a person (ish)

Ability scores.
Stats.
Numbers that make up the character.

You don't get a to-hit bonus for telling the DM exactly what you do in combat. You say "I parry", not "I employ the third variation of Bonetti's Defense on the orc's upstroke".
You don't get to have a mechanical advantage on your character for having personal areas of expertise.
Why would you get a bonus for RPing what you tell the farmer's now-widow? "I comfort her" Okay, roll.
If you're at a table where you need a mechanical advantage to roleplay, then maybe you don't need to be roleplaying.

I play World Of Darkness.
My Changeling storyteller-hobo doesn't NEED to be given magic juice for telling stories or magic rerolls for believing in them. He's going to do it anyway.
Maybe the changeling doctor on the other side of the table needs to be given magic points to go be all gung-ho about some justicin'.
At which point, the game is giving me a mechanical advantage, and dictating to the other person how to play their game.

I don't agree with out-of character favouritism.
Your character SHOULD have stats for his/her/both/unsure/inapliccable intelligence, wits, charisma and so on.
If your character is as socially apt or as smart as you are, then why not be as weedy or asthma-ridden?

It's a game.
You're not being you.
If you want to play a brilliant genius, get a big intelligence score and roll to know things or be smart.
If you want to be a huge barbarian, get a big strength score and lift heavy things and hit some things with some other things.

You're at the table, your character is on the table. Use the numbers.