I wouldn’t necessarily say that, it does work well for a lot of projects when used as an all in one package to have all development on, especially when it’s a public instance for many different projects such as GitHub.

Oh I wasn't necessarily accusing Github, or any other service of being bloated, I was making more of a general statement.

the nice thing about it is that it’s a central bug database

I'm honestly not sure that a central database for bugs is the best of ideas. The issues for a project should, ideally, be tied to, and integrated with that specific project. I think that it encourages more community input -- people can find the components that they like, and delve into that specific component, and its community without needing to worry about anything else in the ecosystem. It may be too overwhelming for someone to have to interact with everything from every other project in the ecosystem, instead of just what they are interested in.