Powerful tools are flexible enough to be used correctly by knowledgeable people and help people become knowledgeable. Badly designed tools are tools which don't help people become knowledgeable and don't prevent unknowledgeable people from harming themselves or others using them.
Atlassian tools, like JIRA, are almost always powerful and flexible -- capable of great good in the hands of knowledgeable people. However, they are not well designed tools, and so - the vast majority of JIRA installations and setups are just as broken as the orgs which install them and JIRA offers absolutely zero assistance or resistance to that brokenness.