I always have Jira questions. I am not satisfied with the Atlassian forums, but I love everything about Stack Exchange. So, is anyone else into a Jira Stack Exchange site?
Questions about using Jira as an application can be asked on Web Applications.
Questions about interacting with Jira programmatically and integrating Jira with other development tools such as version control are on-topic on Stack Overflow.
Sure, that's a lot of different pieces. But these are pretty disjoint topics, too. I don't see a need for a unified Jira site.
If you do think that there should be a unified Jira site, you can propose one. But you'll need to make an argument that the existing sites don't serve the community well. We create sites to address a need, not just “X wants its own site”.