I've been thinking of something like this since LLMs became popular. I've toyed around with some proof of concepts, but haven't had the time or motivation to work on it lately. I love the idea of tagging everything and showing connections when you're searching for things. Also semantic search would be great, like "blue website with information about databases I read last week" would be super powerful in my opinion.

I really love the idea of digital knowledge bases, but as you said, I think we're leaving a lot on the table. I need to get back to my project of a user-owned-data knowledge base.