You don't need to improve upon all metrics, depending upon the application. For grid scale storage, for example, energy density can be very bad; even inherent

You don't need to improve upon all metrics, depending upon the application. For grid scale storage, for example, energy density can be very bad; even inherent safety can be compromised because it will be operated under narrow conditions, while costs should go down. For airplanes, energy density needs to significantly increase, while keeping safety constant. Cost can be higher than existing batteries.