Presumably so it's an easier conversion - you replace the motor but don't have to replace the rest of the drivetrain, and maybe you want the gearstick inside fo

Presumably so it's an easier conversion - you replace the motor but don't have to replace the rest of the drivetrain, and maybe you want the gearstick inside for the look of the thing (although I imagine you likely wouldn't have to use it most of the time).