I also thought exactly this until I read "vim plugin". Clearly this is just a start, a way to have something running and make people talk about it, a way have

I also thought exactly this until I read "vim plugin". Clearly this is just a start, a way to have something running and make people talk about it, a way have real users testing their technology... And being a YC startup help having a relatively large audience even for this kind of launching with an uninteresting product, so the real world technology testing will work, and I'm pretty sure that's all they care about for now. When they start developping plugins for other apps using the same already-tested-and-approved techno, it will get interesting. This seems to me like a case of "launch now, code later", which in this context may be a good idea. Oh, and by the way, I'd like an Emacs Lisp implementation and an open protocol (and a unicorn).