Because in hub motors are generally a bad idea. The more weight you shift to the unsprung portion of the suspension, the worse handling, ride quality over rough

Because in hub motors are generally a bad idea. The more weight you shift to the unsprung portion of the suspension, the worse handling, ride quality over rough surfaces, and energy economy gets. Even worse, the geometry of an efficient induction motor is a cylinder, and you can add torque by lengthening the cylinder. With an in hub motor you need either axial flux or to bond in permanent magnets, both of which complicate manufacturing. On the other hand, a universal joint and a drive shaft are about as straightforward and reliable as it gets. You can still have a motor per wheel and size is not as restricted. Long story short: in hub motors don't make sense unless you're very space constrained, like on an e-bike. You can build a good enough demo to get press. Once the vehicles are out there as a product for a couple years the flaws will be clear.