I'd say Atlassian products in general. Jira has had a notorious bug for nearly a decade (still ongoing, I believe) that would delete a description/comment if you accidentally hit escape in the middle of writing it. Bitbucket also changed the term "blame" to "annotate" because "blame" was a strong word that hurts feelings (seriously, this is the reason) and didn't bother telling anyone until people started wondering why blame wasn't supported. Also there was the time they displayed a huge ascii rainbow logo every time you pushed a commit, which is pretty distracting, considering you're expecting to find info related to your push while you're working (you had to turn off this info altogether to stop seeing this logo). I could go on, but basically, Atlassian isn't terribly interested in your productivity.
Jira is slowwwwwwwww. Like using index cards on a whiteboard would be faster.
If you want to make sure no one ever reads a document, put it in Confluence. Unless you've bookmarked it, you'll never find it again, let alone anyone else.
