I agree salt does bring out the flavours in dishes when cooking, but when its used its used for "salting to taste" i believe everybodies tastes are different and each restaurant therefore is going to have a different flavour, subtle but different.
That goes for all seasonings/spices, thats why when you go to someone elses favourite restaurant, that they absolutely rave about, you usually come away disappointed and revert back to your own personal favourite.
I think we choose restaurants/takeaways because they serve our own particular sense of taste, we dont just walk into the first one we see and find its excellent, we usually wander around trying different ones over a period of time until we get that eureka moment.
And i dont care what anyone says cornflour is used purely as a thickening agent.