I keep hearing people say that Bourbaki is difficult for most undergraduates but I still don't understand why. Surely if it starts from definitions/axioms then practically anyone should be able to understand it, let alone just graduate/advanced undergraduates. I didn't have any trouble reading Euclid's elements, so it has always baffled me as to why Bourbaki should be so difficult. The most familiar response I get is that Bourbaki is "abstract". What does this term actually mean?
Thanks in advance for answering my questions.