I’ve always assumed it was my learning style. I do best with a global perspective first. Then I have a scene to fit all the details into. But the cake docs are presented in (what I think of as) a more traditional rule-list form.
Rule-lists are the least effective way for me to learn anything. This is the reason I drew the UMLs. But I haven’t decided how much detail they should have to be a useful and maintainable part of the documentation. Less detail than I have included so for I’m sure.