I'm actually okay with Jira. I can't understand why they don't address performance, but I can roll with it because its not that abysmal. I honestly haven't seen something much better out there so it is what it is. It's confluence that I absolutely hate, thats where the performance and generally sad state of the UX gets to me. Bitbucket is even worse, but I had forgotten about its existence until recently because the company I now work for uses that clunky POS. There are good alternatives to those products, but somehow companies get roped into that garbage because they are already using Jira.

How can Atlassian have all that staff and such shit products?

Edit: I know the answer because I've been a company that did all of this. Build new shit and don't focus on the main product, then lay off your staff.