Well, if a driver and his engineer can't setup a car to be 100% competitive on any track they should be kicked to the curb. I can never understand when drivers complain about the car setup wasn't right for them, thus they sucked. It really shouldn't (isn't) be that difficult to setup your car to be competitive on any track, with all the data they accumulate each year from the same tracks, they should have good base setups, and then the driver should know where to make changes to improve, irrespective of the actual car design, then that's where the setup comes in to make it suit the driver.
Of course the setup will have compromises, but make it suit you as best possible.
If after a few laps you can't figure out where you will need to make changes...rather join a different sport, like curling.
At the moment Perez sucks balls, since last year in fact.