For the hooks and key bindings: it is an alpha release of the initial version. Those things may come, and will come if it becomes successful and users want it. Certainly, it has to provide a way to really store documents. The cloud then is a natural choice for this kind of tool.
Also, I think this doesn't need a linter, as the UI limits you to creating valid documents, and it has live preview because it is wysiwig (it isn't TeX and doesn't aim to be)
I would guess (but it is not my project) macros are unlikely to come soon, if at all.
