Yes I am well aware that their eyes are not actually slit, I didn’t mean literally. Look at the pupils. Point remains. As I said I can buy it as a coincidence but it’s still an unfortunate one.
And if they all talked with a California surfer accent, nobody would even notice the eyes.
If the Episode III doc about designing General Grievous is typical of the process, characters are designed with just a vague description by George, and the concept artists never even see the script.