Who is the Stig ??

Also… why does he take the same line for every car, barring any variables such as understeer and oversteer?

and wouldnt you normally take the best line regardless of what youre driving? Also the F1 drivers arent driving F1 cars, so why would they take a different line? You would think that being a pro driver, theyd easily adapt to what theyre driving, whether it be a shopping cart or F1 car.