Also, IndyCar used a gravity feed fuel system. The fuel is feed from an elevated tank. F1 used to use a pump fed system.Formula E's car swap is just bizarre.
The jack system is heavy. F1 decided it was too heavy. A jackman adds no weight or complexity to the car. F1 is the only top level series that doesn't have built in jacks, (excepting NASCAR of course) but it also has by far the lightest cars.