Chopabeefer - do you ever fly single pilot? Have to re-fold a map? Look up a frequency?
There are a ton of things you have to do with your left hand that requires removing it from the collective -
That's the reason for the delay between engine failure simulation and the pilot taking action above the knee.
While the current method of developing the H-V curve isn't perfect, it's a starting point, and how it is developed is something that all helicopter pilots should be aware of, as well as having it demonstrated sometime during their commercial or instructor pilot training.