I think Emacs still does all of this; the argument the author makes is that it is "arcane", it just uses conventions he is not used to. It is however fully self-documented and interactive. For me the best textual interface I've ever used remains Magit in Emacs: https://magit.vc/ I wish more of Emacs was like it. I actually use emacs as my git clients even when I'm using a different IDE for whatever reason.
It just came up with conventions few others adopted later when they reinvented the wheel.