You know there are many ways to get a shape,fender of the car is just one of them made using ISO function to extract G2 points..

About joystick handle i think that is more accurate to make it with my method because SWEEP has the rails that force sections to follow them
sure you can do it also using loft but you'll need lot of sections if you want to follow that profile and,when closing,you must use a little section to the end of the chain