Commendable breadth in your vision ! but might I suggest going more... atomic? As someone who leans towards outlining, your "tasks" type caught my attention. Ideally, I wish each block could behave like an object in a similar fashion. While transforming blocks into objects is possible, it somewhat defeats the purpose of an outliner's "bird's eye view."

I also doubt the feasibility of centralizing all your personal knowledge in one app; there's a corollary to this. I consistently find myself in need of a "merge feature." The larger the database becomes, the more crucial this feature is.