Apple store employee here. This indeed does happen although after a while you get pretty good at judging a 70 deg angle without an app.
From anecdotal experience, it really does make a massive difference in the level of interaction customers have with the products. Even if people just come in because they haven't been in an Apple store before, the first thing they do is push the screen back and by that point they've already started interacting with the computer.
From anecdotal experience, it really does make a massive difference in the level of interaction customers have with the products. Even if people just come in because they haven't been in an Apple store before, the first thing they do is push the screen back and by that point they've already started interacting with the computer.