Casual is not intended to be a power user tool nor is it intended to be a replacement for mouse-driven menus. Casual has no intent to exhaustively cover all modes available in Emacs with keyboard-driven menus.
While Casual is mostly in alignment with Emacs command naming, there are cases where it will make an opinionated change if the name is deemed too vague or idiomatic.
That said, many existing default Emacs bindings are replicated in Casual. Such correspondence should be considered incidental.
Given that Casual is early in its life-cycle, expect changes to its user experience in terms of menu hierarchy and keybinding choices in future releases.
Editorially, all design decisions for Casual are ultimately the opinion of Charles Y. Choi.