It looks pretty standard ... it does have GitHub integration enabled, and custom fields and workflow for each project, which seems like a pretty standard thing

It looks pretty standard ... it does have GitHub integration enabled, and custom fields and workflow for each project, which seems like a pretty standard thing for organizations/users to do. But my key anecdote is about loading the notifications sidebar after the page has loaded, there shouldn't be any customizations in there. But I dunno, maybe Jira gives managers a bit too much rope with which to hang their development teams.