That one was going to be commercial, hence why. However I would rather prefer its successor, with Limbo for userspace, although probably not Tk as the main UI

That one was going to be commercial, hence why. However I would rather prefer its successor, with Limbo for userspace, although probably not Tk as the main UI toolkit. The terminal thing emulating typewriter are a UNIX thing, as other graphical OSes, presented a plain REPL, or graphical shell, e.g. Amiga DOS did not emulate any tty. Otherwise I agree with the spirit of the comment.