They wont lock them away. A couple of years ago when the 6 Plus came out and we had the Bendgate issue, people were going in to the Apple Stores and deliberately bending the phones. Apple didn't respond by putting them in a glass case.I guess we have to have all appointments to look at all phones.
Some of the phones in Apple Stores are in a terrible state from people handling them all day long. It doesn't put people off