During UX discussions around async (EZP-24178) tree operations features, and especially handling cases where Editors or even Admins accidentally deletes large subtrees causing:

• systems to go down or slow down considerably during operation
• need to restore the content

It became clear that something (policy could handle this for editors easily, however that would not cover use case for power users) should warn users when they do large scale batch operations.

Either way UI will need to make it clear how many items is affected, and either they might need to enter a administrative modus like JIRA does requiring to re enter password, or need for approval to accomplish the operation.