Sure, and I get all that— it definitely makes things easier for the creators and maintainers of the software, and it's easier to deploy it too, so it's a win for small shops who aren't yet committed to a lot of other tools, or are fine with being committed to an "omakase" experience where everything is okay and nothing is best-of-breed.

But there are definitely some customers who are sidelined by this approach. Atlassian is pretty committed to tools that talk to each other with documented APIs (Jira, Confluence, Bamboo, Bitbucket/Stash), and for large organizations, that's often a better fit.