There was a side thread in the CoC thread about expanding the dev community and making it easier for new devs to get involved. I would think that a bug tracker, especially one where bugs can be labeled as "Newbie Friendly" could go a long way towards that goal.
Additionally, a proper bug tracker would make it easier for future users to find resolutions to issues.
Are there any technical reasons that the project doesn't use a bug tracker (beyond pgsql-bugs)?
Jim