Does that really matter? Take a bloomberg terminal - its literally arcane. If you don't know the specific commands to type, and the stock naming system they and only they use, you won't be getting anywhere.
You would never have someone make an interface like that today. At the same time - it works. Once people get learn it, it moves into muscle memory. Since it obeys internally consistent rules, its also possible to uncover more functionality once the first beach head is made.
If you want more brutal examples - think of DwarfFortress, nethack and other ascii based games. Once you know the command structure, it becomes second nature.
You may not need a beautiful interface. The interface is just a wrapper.