I wasn’t surprised by the question (how come Shakespeare wrote in 5 acts, not 3) but by the answers, which are surprisingly detailed regarding the history of dramatic structure.
But I’m confused, because I thought that Shakespeare himself made no Act/Scene divisions at all, that came later with publication of the Folio.
Somebody correct me if I’m wrong? Or are they talking strictly about structural elements, i.e. there’s 5 segments to the progression of the story whether Shakespeare labelled them that way or not?