I have mentioned this both in the readme and the OP. Simplified:
The go doc process for static HTML documentation generation is cumbersome and awkward. This simplifies it greatly considering it is stateless, performant particularly in CLI usage, and not a server like go doc.
Go doc has outdated and limited UX, this is modernized, and it is in the roadmap to be extensible and themable, unlike go doc.
Go doc lacks syntax highlighting, this will use prism for syntax highlighting.
Go doc does not have symbol search with anchors, so you can’t go to symbols/packages or search through them easily. This does.