Comment by kstrauser
I had some thoughts on Jira: https://honeypot.net/2021/10/01/jira-is-a.html
TL;DR it's so completely customizable that it's more like a DIY project management toolkit. Pivotal and Linear have/had a more opinionated approach: "here's how you manage projects. Good luck and have fun!" Jira almost seems to push otherwise rational people to build the most baroque processes imaginable.
it's the super customizable ones that end up adopted across large Enterprises. Flexible workflows I guess. eg Salesforce, Jira