It seems that this motor's power-to-weight ratio advantage applies just as well to ground vehicles. Are there reasons why that isn't the case? I.e. is this ap

It seems that this motor's power-to-weight ratio advantage applies just as well to ground vehicles. Are there reasons why that isn't the case? I.e. is this approach somehow specific to heavier-than-air engines? (Also, speaking not necessarily to using this specific motor, but rather applying Siemens' cited optimization techniques for ground applications.)