No one is suggesting we should install right away an inefficient system. What is suggested is that such a system would be useful and should be developed further to make it both practical, affordable and efficient. At its current stage, the technology is obviously not mature.
An what's with the frustration about electrical cars? Do you really believe the concept doesn't go beyond the aspiration of sum assholes or of Tesla motors?
Anyway, you might be surprised to learn that electrical cars are more effective and save energy when compared to comparable internal-combustion engine cars. An they would still be more efficient and energy saving, even with 25% addition loss, which doesn't imply that this 25% loss is in anyway acceptable.