Bugtracking isn't simple task tracking. You're looking at issues and detailing the history of both identifying the root issue and its resolution.

Doing so on a publicly accessible (and modifiable) bugtracker means you get a social / collective intelligence (and collective stupidity / vandal) effect. More useful for community projects than home ownership, but still.

I've seen workplaces where non-software issues (often facilities / maintenance) were tracked and managed through bugtracking tools.