What’s the reasoning for no backspace? I understand not allowing edits before the current word but I am a very clumsy typer, and this made me pretty frustrated when every other word had a typo.
It may not be for you, then (and I don't think it's for me, either), but that seems consistent with the idea. You're supposed to let go of any kind of editing and just go go go. You can edit it later.
I’ve found that while trying to write down the ideas in my head, it’s very easy for me to lose my train of thought if I edit while I write, which I can’t seem to help but doing. Not being able to go back at all, or to glance at anything I’ve already written, has helped me keep my inner dialogue moving without interruption. It felt odd at first, but I very quickly got used to not editing myself.