I have a theory: Back in 1996 Bugzilla worked very well. It had been designed, and honed, by a bunch of senior developers who also wrote the bug management system. So lots of dog food eaten. iirc it was written in Perl.

Then, someone I believe decided to make a "Bugzilla in Java", because they didn't like Perl (reasonable).

But whoever that was didn't have the deep knowledge of how the thing was supposed to be used. Lacking that insight, they created a "Swiss Army Chainsaw", implementing simultaneously everything, and nothing.

Next, some MBAs got hold of the thing, and made everything 10X worse.

Meanwhile, Bugzilla is still the same and still the best software project management tool, if you know how it's intended to be used.