I think its brilliant having issues tracked in fossil. Part of the promise of github is that the user is in control, since your computer is a first-class citizen of a repository. You have all the code, and all the history on your computer. You can use github, but you don't need github, since its just another node in git's distributed network.

But that promise falls apart with issues and pull requests. Issues and pull requests don't get replicated by git. If github goes down, you can't interact with issues. If github ever turns evil, or you decide you want to self host git over ssh or something, you lose the history of all your issues and conversations.

Git is a distributed, replicated data format. Why are issues fully centralized? Its bizarre - You can have a project on both github and gitlab. And you can replicate commits to both. But you can't replicate issues using the same mechanism.

Fossil is far from perfect, but I think putting the issues and stuff into the repository itself is brilliant.

https://fossil-scm.org/home/doc/trunk/www/fileformat.wiki

This is from the same person who made SQLite.