As the Administrator you have the power to control everything within your portal. So, please add the ability to move (Not) just the content of a user's portal content folder, but move the folder itself with its content to a different portal user's content folder. - And it not effect the webmap, services, etc. This would be similar to to change ownership functionality already included with Portal for ArcGIS.
This will improve the process when employees leave, and you need to move or re-assign their content. It will also help with a change in the publishing workflow.