Clearing the desk messes up the sort and leads to inefficiency as people search fruitlessly for lost documents.
If it's outa'sight it's outa'mind, and the work will never get done.
Consultants are another reason why the Second Amendment was devised and given such prominance in the Constitution.
I've had bosses describe that as the paleontology method of filing. That project was active when trilobites were alive so the paperwork should be right here ... [ pulls out report on project from deep in a pile]