As a tester, I work on Jira a minimum of 4 days a week.
While it is really easy and convenient to track the tickets and bugs' progress and keep it in one place, the logging of bugs takes a lot of time as Jira is starting to throw errors while uploading media and making the process lengthier.
Also, they should work on improving it for Linux users so that we can add screen recordings directly.
Otherwise, it's good with all its other features like different project boards for easier project management, their sprint planning and tracking template, and many more templates. Their confluence for keeping documentation also in one perfect place and allowing restricted access makes life easier and simpler.
And their app is also quite user-friendly!