I don't use Notion heavily, but I've worked with any number of local editors that support transclusions and backlines. I think this is a wonderful system for individual and organization use. Basically, when all the docs are owned by the same entity, and there's no microtransaction BS, or the misguided idea of perfect traceability of every word on the screen (as opposed to just, you know, copy and paste where appropriate), it's blissful.

But extending that to the whole world's publishing needs? Hah, yeah, no way. I think that these systems, and especially the web, are more vast than Nelson's ideas could possibly have scaled to.