Yep, but the biggest problem is that PD uses most of the power if the PS3 for the graphics of the game. This is what they have been doing for about 10 years now. Everytime they release a GT game it looks fantastic, but it lacks a lot of feutures compared to other racing games. And every time they kinda come up with the excuse: "Yeah the Playstation of this generation is pushed to the max for this game and we just cant do anything more till the next generation gets released, and then you'll see <input feutures you want here>".
But once the next Playstation gets released they just use most of the recources again for the graphics, and come up with the same excuse again. I guess the next Gran Turismo on a new console will not have much more feutures than all the GT's we have seen so far, it will just look better.
And its the same thing for the sound. PD spends to much time and resources getting the best possible graphics (and even failing at it, lack of AA, screen tearing) they wont put any effort in the other aspects of the game (or at least not enough).
Maybe Sony just needs to be a little more like Microsoft and they should try to steal some good sound engineers from some other game studios that have proven themselfs. Same goes for the moddeling, it might be better for them to do the same T10 did with Forza, look for a external studio that can make the car models for you. That way they have more time to improve the engine and overall feutures of the game.