My 2¢: Confluence's primary job is to share and manage lots of written documentation. If I wanted to make such software I'd make it fast, the curation/management job lightweight and inline, and emphasize readability and promote fast comprehension of information with layout and design.

Confluence is slow, curation/management is ponderous and the design ignores hundreds of years of research / practice in visual processing of information.

Probably the only end user software you need to look at the documentation to do any search but a simple keyword search

Which is sad because the pre-acquisition confluence wasn't even bad...