It not a question of technically perfect or otherwise. It’s just a pure question of cost. When one approach is half as efficient as the other, it hard to see h

It not a question of technically perfect or otherwise. It’s just a pure question of cost. When one approach is half as efficient as the other, it hard to see how you build a cost competitive product using the less efficient approach. Especially when the more efficient approach is already approaching price parity, with a much cheaper technology (diesel from the ground is much cheaper than diesel from the air).