Yeah, in the case of Git, the web ui is very simple, as Git only cares about code. In the case of Fossil, the web ui is extensive, as Fossil stores all types of data, not just code.

As an interesting example, the very website in this submission (fossil-scm.org) is in fact just a standalone Fossil website, running as you'd run your own repository. Everything that is on that website, is something you get for free for each repository you use Fossil for.