I think the print at home option is similar to Will Call. You have a receipt that says you paid for a ticket. You still have to show up and collect your ticket. Sort of like going to the theater or a concert.
There are tapstiles, not barcode readers at the entrance. Your piece of paper does not have a chip that the tapstile can scan.
You can do a sort of virtual will call with
MDE. If you have a magic band you are all set because it does have a chip and can be linked. Most people fall into this category. Others will have to exchange their paper receipt for ticket media in order to gain entrance.
That's my understanding from the MDE explanations about MBs and FP over on the FP board. I have not been to a party yet. We have had to collect tickets at the parks because DH does not use an MB.