Thanks for these thoughts Ryan! It’s definitely something I have been thinking through (and concerned about) while watching this sudden explosion in PKM stuff.
If I am reading and understanding your points here, it seems to me that you are essentially envisioning a linked data PKM schema and a linked data enabled (semantic) blog.
If you’re not as familiar with linked data, it is essentially web 3.0 as Tim Berners-Lee argued. I won’t go into all the nitty-gritty of linked data (it can get really complicated very quickly) but there are a good amount of teaching tools out there (including my presetation here slides 16-24 here).
But I think a good way of thinking about it is thinking about the Recipe schema, which is marked-up formatting that allows a user to plug in a URL to a cooking site and save their own copy (lots of sites allow this now).
Another example is the Google Knowledge graphs, or the way that google has been linking to specific hilighted passages of text, like this for example :
https://github.com/mbakeranalecta/sam#:~:text=Semantic Authoring Markdown brings the,text editor -- like markdown.
I point to that repository because it contains a draft specification for semantic markdown. I would love to see something like that happen. The ability to do something like [[Barack Obama]] in your own PKM and have a knowledge graph or certain facts about Obama rendered in edit view = killer feature.
A interoperable PKM schema that was accepted across the web (or by a majority of players) would allow posts on different sites to be collated together easily, and cleanly and without a need for formatting. There are some tools to render tweets to markdown and then pull them together, for example.
This would allow for a variety of different platforms, technologies, and so on to be put together.