Originally posted by Kunsoo
I mean, if black fianchettos on the king side and you want to attack it, you're probably going to castle queen side. So what's the advantage of the advanced c pawn in a kingside attack?
Castling queenside is only one of many ways to play against a fianchetto, and it may not be the best- for instance, the strongest lines against the Gruenfeld and King's Indian Defense all involve white castling kingside.
Back in the day, Sicilian Dragon players began the game with 1. ... c5 and 2. ... Nc6, and the Maroczy Bind almost put it out of business. Later on Black players (I think Botvinnik was at the forefront, but I can't remember) innovated with 2. ... d6 in order to avoid the Maroczy Bind.
Even now it's impact is strong. The Accelerated Dragon offers many significant advantages against systems such as the Yugoslav Attack, but the main reason it is not more popular than the regular Dragon is because it allows
the Maroczy Bind.
In the Dragon, if black can get in ...d5 without severe negative implications, he is at least equal. The Maroczy Bind makes that plan extremely difficult if not impossible, and also does not give black an easy target to attack. It is NOT the kind of game most Dragon players seek when they decide to play the opening.
I think the answer to the question is to begin by reassessing the assumptions behind the question.