The problem with the mission statement mentioning Notion is that notion is too big of a product and you are probably only aiming to displace a small part of it.

Secondly, if a server cant be spun up alongside this that serves markdown editing, that others can access immediately without going through a setup process, for guerilla collaboration, then it is not replacing notion. It is simply a different medium.

Notion is a lot of things; pages, triggers, actions, databases, and agents. You are focusing only on pages.