I just found another interesting reference: Categories for the practising physicist. Although this is not exactly about discarding undue abstraction, it does present many concepts in terms of concrete examples, and there are even real-world categories defined in it!
I just found another interesting reference: Categories for the practising physicist. Although this is not exactly about discarding undue abstraction, it does present many concepts in terms of concrete examples, and there are even real-world categories defined in it!