Jazz people think more musical, more like the actual composers that classical musicians play. Classical musicians don't really know what they want to do. They start as kids and learn to play the notes because their parents sent them to lessons. Later they actually start to like the music(or if they don't they quit). But at this point they have no musical goal. They just play the music everyone else played before, and probably much better. Of course we need some good concert pianist and some full orchestras. But those jobs are almost that, jobs. Just like building a car or any other product.
But jazz musicians are beginging to suffer from the same syndrome now.