The concepts themselves aren't difficult to understand. It's just that some people go out of their way to use uncommon terminology that ends up obscuring what they're trying to say, rather than making it clearer.
Imagine trying trying to describe a monoidal category or topoi in the OOP style, it's like trying to describe what a Fourier transform is to someone who insists on using roman numerals.
Or describing Latin declensions to someone who reads kanji. The key is that, if the audience admires Latin speakers, you can appear smart.