K.I.S.S.
I am repeatedly baffled as to why anyone chooses to pay for Atlassian product. At first glance the web UIs look very shiny but once you start to use them you realize how disfunctional they are. Bitbucket provides nothing that services like Github or others don't. Confluence is a piss poor wiki/colab/CMS compared to many others. And Jira, well Jira, is possibly the most inflexible, sluggish, non-intuitive issue tracker I've used. Even Mantis & Bugzilla are better and Jira doesn't even come close to addressing the sort of peer review that should be de rigueur these days let alone safety or security critical development regulatory requirements.
There are open source integrated systems that provide the same functionality available online, self-hosted or hybrid. In the past I've rolled more effective systems piecemeal from the likes of Subversion, Mantis et al.
The only worse sets of tools I've used are PTC's (Windchill PLM ...) and LDRA's code analysis, especially given the eye-watering prices they charge.