I can't believe an avowed anti-metagamer, anti-player-knowledge zealot posted this.
So you're claiming that what's essential for roleplaying is not just the numbers on the character sheet, but also how those numbers were generated?
That strikes me as a purely emotional, but logically indefensible, position.
Let's say we're in a game together, and the DM lets me play a new race that you didn't know about. I let you look at my character sheet. I roleplay the character according to the fluff. I show you artwork that I found on teh Interwebz. I have a hand-painted mini.
Are you seriously saying that without knowing how I arrived at my ability scores...without knowing what the racial ASIs are...you don't really have a sense of that character?
If so, perhaps you genuinely feel that way, but I'll note that to an observer such a position is indistinguishable from "I don't really have an argument for how racial ASIs impact the game, so I'm going to dig my heels in and say that it's the method, not the result, that matters."
Do you really think for roleplaying there is no difference between "Even as a child I was always stronger than other children" (put a higher value into Str), "I trained a lot in my spare time" (Put stat increases into Str) and "Strong? If you think so. Where I come from everyone can do this" (Racial Str bonus)?