There is a different social contract between GUI and CLI project maintainers and their users. A menu item can be renamed or moved around and the only thing that

There is a different social contract between GUI and CLI project maintainers and their users. A menu item can be renamed or moved around and the only thing that breaks is the mental model of users who knew precisely where that menu item was; a CLI option, for example, cannot be renamed or removed without breaking someone's automated script. Given that difference, some people prefer the stability of their tools not changing on them and prefer CLI/terminal work in general. The difference in social contract may not apply specifically to an email client but a given user might be more comfortable in a terminal than in a GUI.