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Torque is what determines how fast you accelerate (or if you accelerate at all). Basically, if you floor the gas pedal, the controller will try to pull max line amps out of the battery to send max phase amps to the motor to accelerate as fast as possible. Now if you are on flat terrain with no wind, the motor will need less and less power as you come closer to max RPM, because inertia will mostly keep you going and the motor only has to overcome air resistance and mechanical friction in the system.
And yes, it is indeed possible to overbuild the battery power. But it's not wasted energy, remember, the motor doesn't consume power that it doesn't use (if we ignore heat loss), it's just wasted money, because you could have bought a cheaper battery with lower discharge amps. Still it can be good if you plan for lower charge times, for example, because most batteries with high discharge rates also have high charge rates. And you can always limit line amps and phase amps in the controller if the vehicle's acceleration is too strong. Or just don't floor the pedal maybe.
And yes, it is indeed possible to overbuild the battery power. But it's not wasted energy, remember, the motor doesn't consume power that it doesn't use (if we ignore heat loss), it's just wasted money, because you could have bought a cheaper battery with lower discharge amps. Still it can be good if you plan for lower charge times, for example, because most batteries with high discharge rates also have high charge rates. And you can always limit line amps and phase amps in the controller if the vehicle's acceleration is too strong. Or just don't floor the pedal maybe.
