Some editors keep on doing workarounds to update and use blocks and page templates they don't have access to. By copying these items in EditorGUI they have been able to override access rights for blocks and page templates, which are set to only be accessible for Admin. We want to limit the possibility of publishing without permission, it's ok if they copy them and edit them, but not to publish them.
Also if you have the correct access rights, and copy and paste a block or page template in the CMS, it gets published directly without a warning message. We want elements to be verified before getting published, so that we can avoid misuse and unwanted publishing.