[jkaptur]

"... if all knowledge were stored in a structured way with rich semantic linking..." this sounds a lot like Google's "Knowledge Graph". https://developers.google.com/knowledge-graph. (Disclosure: I work at Google.)

If you ask an LLM where you can find a structured database of knowledge with structured semantic links, they'll point you to this and other knowledge graphs. TIL about Diffbot!

In my experience, it's a lot more fun to imagine the perfect database like this than it is to work with the actual ones people have built.