Re: specialization versus generalization, Robert Heinlein said:
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects."
You might say capacity can be it's own passion.
(I read this quote recently, and it may have been here on this forum or on the MMM blog, can't remember)