"Abstraction is a path of least resistance, a form of mental laziness."

This can be a good thing. Abstractions, such as category theory, often generalize to many other more specific domains. "Abstract nonsense" can teach us much about the world, and it can allow you to transfer your knowledge from one domain to another. I suppose you would now like to see a concrete example of abstract nonsense at work. However, my time on earth is limited.