Reminds me of a Heinlein quote:
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.

I'm with you on learning a variety of different subjects. The problem with specialization is that the learning curve in any subject flattens out after a while. We get a limited amount of time here on Earth and if you want to maximize your learning you have to stay on the steep part of the curve.