To me, (history is) a great source of systems evolutions and dynamics examples.
Writes Michael Dubakov in his article about hypertext tools from the 80's.
He goes over a few different systems that use Hypertext, and some of them have pretty advanced features, even today.
For instance, Warm Linking, which gives you the ability to push and pull content across links.
Most notable is that the internet didn't evolve this way; It's less connected than it was before. Tools like Notion are trying to provide a universal hyperlink content document editor workspace... thing... But they're limited, and most of us spend time in multiple webapps instead.
It's well worth a read.