This matches my understanding of the best approximation a Cadence sensor can make.That's not the case with at least my Espin Sport.
I have a power output setting on my display and the power output varies based on how fast/slow I am pedaling, when I pedal slower, power output is higher, when I pedal faster, power output is lower.
The way this works is similar to a torque sensor... when you pedal slower, the assumption is that you are having a harder time pedaling so it increases the power to the motor... like when you first start pedaling or when you start pedaling up an incline. As you pedal faster, it reduces the power which follows the logic that you are having an "easier" time so the motor needs less power.
Assuming you always wish to pedal at 80rpm for example, if you are pedaling slower, it assumes you are struggling to reach that cadence and raises the assist, as you are able to pedal faster it reduces the assist assuming you are having an easier time
That scenario is a valid one, but it is not the only one. There will be cases, where you are pedaling slowly with little effort because of leisurely pedaling, and in that case the fact that it will push the assist wont be a good thing.
But once you know this is how your assist is programmed, you can adjust your gear and pedaling habit to match its assumption.
It is definitely not as good and exact as a torque sensor, but can get closer for a majority of situation.