Theoretically this may be true; but in real
life incommensurables are commensurable.
Only a criterion of judgment and a system of
weighting are needed. In nature the criterion
is survival. Is it better for a species to be small
and hideable, or large and powerful? Natural
selection commensurates the incommensurables.
The compromise achieved depends
on a natural weighting of the values of the
variables.