Will,
You asked why there is genius in golf design:
If the body of work for an individual is considered seminal study for any beginner, would you not consider that work atleast good?
If the body of work for an individual is tops in its field during his life-time and continues to be considered of the best long after he has passed, is this not noteworthy?
If the body of work for an individual is considered so good, that even an experienced person in the field desires to emulate even part of that body of work, is this not exceptional?
If the body of work for an individual is so good that others attempt to duplicate the work, but fail to do so. Is this not an indicator that the person maybe unusually talented?
Mac stands head and shoulders above almost all golf course designers. Of the rest, he stands shoulder to shoulder.
As for genius, you seem stuck on Einstien. If he was the pinnacle of genius, what musical masterpiece did he create that changed the nature of musical history? How about painting or sculpture? Let's try chemistry? How about architecture? Of FLW, what musical piece did he create? What fundametal law of physics did he establish? What great architecture did Mozart create?
I would proposed that a genius is relative to his/her field of expertise, not relative to OTHER genius.
In golf course design a handful of designers can be called genius. I use this term since on a grand scale they created art and used science to create a challenging functional product that could be used by the young and old, small and large, skilled and unskilled, for many, many years. Herein lay the genius of his work. And their work is a living textbook for future designers.
The simplicity of construction does not deny genius, for Michelangelo's David only required that he chip away all that did not look like David.