Two completely different animals. The JL is being adapted to work with its solid axles and transfer case. All other electric vehicles are build from the get go to have all the electric motors, battery packs and computers built into its subframe, "skateboard" if you will.Crammed with what? There is nothing that "needs" to be in that space.
Here is the front trunk on a rivian. That thing also has 4 motors. One at each wheel.