This is one area that I haven't watched that closely, so I can't comment on how NY pizzeria owners do it. I get the feeling, like most things, that they probably don't care.
I do know, from my own experience, that the bottom of the dough is pitted/not that aesthetically pleasing, so if I use the top of the dough for my rim, I get a prettier rim. This is also a strong impetus to ferment in trays rather than in containers, since it maximizes the smooth, top of the dough, surface area.