Import Files Vs. Moving Directly to Y:

System

Currently most of the teamsite users at my company work directly from the Y:. They create/copy/move files from their mapped Y: drive in Windows.

My question is, what is the benefit of using Import Files/Move from the Teamsite GUI as opposed to using the aforementioned method?

What is gained by using the Import Files method through the GUI, or what is lost by not using this method and using the Windows file system?

System:
Teamsite 5.5.2
Windows 2000 Server

Thanks in advance.

Adam
RHI