yes there is that argument of, why can't GTA look as good as PGR4?
I think the answer is simply that PGR4 only shows a small amount of the city you're racing in. GTA has to show every alleyway and tube station, so modelling GTA to the same level of detail as PGR4 would take multiple times more effort and time, and also much more machine resources. It'll happen one day though, infact, you're going to start seeing random city generators soon, that will generate an entire city for you based on simple basic instructions. I've not seen any examples of this, but it would make sense that it'll happen soon.
I think the answer is simply that PGR4 only shows a small amount of the city you're racing in. GTA has to show every alleyway and tube station, so modelling GTA to the same level of detail as PGR4 would take multiple times more effort and time, and also much more machine resources. It'll happen one day though, infact, you're going to start seeing random city generators soon, that will generate an entire city for you based on simple basic instructions. I've not seen any examples of this, but it would make sense that it'll happen soon.