Seems antiquated.
I shouldn't have to print & bring in paper.I should be able to show them my order confirm email.
Buying expensive phone, has issues with printing out a piece of paper....
I think what they are going for is expedited process, not having to pull up an order and then go through more steps. You show them the paper, they scan, mark as done and you go about your day. It adds more time pulling up emails and stuff.