Jira is famous for its great ecosystem for plugins/addons. But not every Jira user is actually using every (commercial) addon productively. So I'm willing to pay e.g 100 Jira user licenses but only want to pay 10 licenses for a commercial addon. Currently this is not possible due to the license model which counts the licensed jira users.
As an impact of that, as an administrator I'm available to choose which of the Jira users are able to use a specific addon.