I've often seen it supposed that the healthiest types are those who have learned to develop their shadow functions, their tertiary function and inferior function instead of relying too heavily on their two foremost functions. By this logic could it be that the healthiest type would be someone who has developed all of the functions to such a degree that they are classified as an XXXX type? How feasible would this be? Do you personally have functions that aren't in your type's stacking that are well developed? How much do you think the average person develops their other functions? Any examples of people who have extremely well developed shadow functions in addition to their stacking?