[impossiblefork]

The unsprung weight won't be changed.

There is one motor connected to each of the wheels, but there is a shaft between the wheel and the motor and a CV joint on this shaft, allowing the wheel to move relative to the motor, and the wheel is sprung.

There are cars with in-wheel hub motors. For example, MW Motors make on of their Luka models with in-wheel hub motors. Those must keep their motors light, and have the advantage that you get more space in the car at the expense of a tiny bit more bumpiness.