Some esoteric methods of measuring CPU utilizations are to calculate either the current power usage over the max available power, or the current temperature over the max operating temperature. Unfortunately these are typically even more non-linear than the standard metrics (but they can be useful sometimes).
except it doesn't really tell you much, because having some parts of CPUs underutilized doesn't mean adding load will utilize them. Like if load underutilizes floating point units and you have nothing else that uses them
