Duplex copying on xerox phaser 3300mfp

I have the same problem and was told by the telephone helpdesk that the machine cannot copy double-sided to double-side. The duplexing referred to is copying 2 single-sided documents onto one single sheet on both sides....Like whoever does that! This is misleading on Xerox's part . Colin B.

Your Machine has an ADF (Automatic Document Feeder)
not a DADF (Duplexing Automatic Document Feeder)
And The one I am looking at will copy single sided documents to 2 sided copies.
Which is the opposite of what you stated , if I understand your statement correctly.
And to answer your question as to who copies the way you described almost nobody but the way the machine is designed and works, almost everybody.
It allows you to convert many single sided originals to duplexed copies cutting the paper cost in half.

I hope this helps.