OC is very much not Story Now, it's Story Before(
Using the terms as explained here) but it's written by the players--preplanned developments or character arcs that they themselves set.
But the reason that I'm into OC is because I am an OC player; I like builds, I like having a flexible plan on how my character's story would go, I like using mechanics to interface with the world(I'm unashamedly a video gamer) and how it affects me as I play it--In other words, the blogpost was very much useful to me because it put to paper the goals and experiences that I'm after. I wouldn't be making this thread if It didn't after all.
I never really care about the world at large in campaigns really, they're importance is mostly as something that I--a player, not a dungeon master--would use. The NPCs, aesthetic, stereotypical personality trait and cultural belief the character holds/is against, 'plot hooks', enemies, etc, etc, these are what I mine from that fictional world . I don't care about verisimilitude or historical accuracy, I don't get to or even want play at the world. I play a character, and the world should facilitate in making that character cool/tragic/fun/horrifying.
Also thanks for
@TwoSix for reminding me of 13th age, I should read into that more but didn't because I heard that a new edition is coming up.