Best use any theory has, is to be inspirational to other theories. Some (or most) theories only apply practically when combined with other theories. Therefore it's quite useless to judge a theory without its full context.
Practical, understandable applications never meet any theory, because all theories base on estimates (at best) about the "real" world, the practicality's world.
Hare never catching the tortoise is a theory which helps to point out the effect of sequential (actually I don't know if its sequential, because I can't get that one word to my head right now) time. It also boggles the mind of an open-minded person.
Think outside the box or at least don't suffocate those who do.