A powerful motor needs more copper between the battery and motor and more silicon in the inverter to handle the current. The motor is also heavier. This is all

A powerful motor needs more copper between the battery and motor and more silicon in the inverter to handle the current. The motor is also heavier. This is all extra cost. All that fast DC charging requires are cells capable of handling the current. You don't get a powerful motor for free just because you can fast charge.