Elsewhere in this thread is the HIPPO acronym, and that's how one ends up with Jira/Confluence: "no one got fired for buying it" combined with "pointy haired bosses love it"

It's been my overwhelming experience that managers love the _idea_ of Jira, but then the day-to-day in the trenches experience of battling its workflow, its markup, its ... everything ... gets pushed down onto busy people, and even if enough engineers revolt, now you have a "well, we're already so committed to Jira we can't leave now" style reply (again, in my experience)