Cause the way UIs look when you want to do a job are discarded as "by programmers for programmers and not normal people", and UIs making an illusion of things working by themselves by intuition of the user and hiding specific actions are considered "user-friendly".

UIs intended for people to do their jobs look, as an extreme, like ed . Less extreme - WordPerfect. XEphem, XGrace, Lisp environments. Those are what you come up with when you want a kiosk, but with a clear idea of a workplace supported by it, or an expert workplace where you do a job.

While things like MSO, Telegram, today's web browsers, and so on - they are intended for people who don't want specifics. They want the illusion of fuzziness of what they are doing.