It would be nice if someone implemented a clone of Bugzilla functionality using modern tech. Jira is the wrong thing to copy imho.
Or maybe just to reach someone who never used bugzilla and doesn't realize it's light-years better than jira or rally.
Bugzilla had a "this is how it's done, and that it is" attitude to bug tracking workflow - it wasn't configureable. As such, it couldn't be perverted into a dozen gates with different approvals needed for each gated step.
It's really easy to copy Bugzilla's structure into Jira. It is very difficult to keep management from changing it into something else in Jira.