This question is about best practices of writing manuscripts in mathematics.
Q. How much "storytelling" in the introduction section of a math paper is "appropriate"?
To clarify what I mean by "storytelling" let me give an example but of course one can find numerous of such cases: In the introduction of a math paper(which I'd rather to keep the names anonymous) almost half of the first page is dedicated to saying what happened in friends gathering and that the author bet on bottle of wines that certain problem has solutions and what not. It was really annoying to me. I wondered why readers need to know all that and how are these stories are even relevant?
Side note: It seems to me sometimes journal editors demonstrate double standards and approve/disapprove this "story telling" matter depending who you are and where you stand in the field.