@arjafi has detailed some reasons that require the organization of elections in SE communities. What conditions have been met that triggered the organization of this election? Is is that some current moderators have decided to resign, or have been removed from duty? Is it because of an increase in the work that moderators are facing, caused by a corresponding increase in the MSE activity? Is it something else?
The Community Managers, most notably Grace Note and Shog9, discussed the matter with the currently active moderators. And we jointly decided (on CMs initiative) that it is a good time to recruit new moderators. Many of the criteria that you listed played a role. One of the current moderators burned out, needs an extended break, and therefore wants to step down. We also use this opportunity to get reinforcements.