We built to the wrong abstraction. We had a choice of two optimisation variables that were conjugates (i.e. you can convert from one to the other like frequency

We built to the wrong abstraction. We had a choice of two optimisation variables that were conjugates (i.e. you can convert from one to the other like frequency/time, momentum/position etc). We chose the one that was simpler to implement, it turns out the other one is actually more expressive and useful for our purposes.