Like you, most people assume that they’re easier to build because electric cars have fewer moving parts. However, when compared to a fueled vehicle, electric vehicles are much harder to make.
However, they do have their own complex systems that require extra assembly steps. Their motors and batteries require a lot of work to build and assemble. Consider that it takes four workers to install a piston engine while it takes six to install one with an electric motor.
On average, installing an electric motor will require roughly 50% more labor than its fueled counterpart.