It's not about being arcane, it's about the lack of discoverability. Emacs and vi don't have (by default) affordances like a menu that enables a user to discover and learn the interface at their own pace. The learning curve is much smoother and allows for casual uses without having to pull a book each time.
FWIW, I started a project last year to build Transient menus for major Emacs modes called “Casual” to address discoverability. Interested readers can find more info about it here: https://kickingvegas.github.io/casual/
Emacs does have a menu by default. It's one of the things I appreciate most about it (especially the Help menu) and I'm always befuddled to see frameworks like Doom Emacs or Spacemacs disable the menubar.
