What happened? I also worked with the JIRA API (on-prem tho), and didn't run into bigger troubles.
The only thing I really dislike is the "discovery" process. I don't have much to compare it to, but going through /createmeta/ and what keys are allowed/work or not and how to get to the correct service, and what data is shown or not. Maybe I did it wrong.
At the same time we stop believing everything we read on the internet. As told to us by the people who now happily believe every oh so absurd made up bullshit on the internet or TV.