I have heard that another reason for some to fold raw to raw edge had to do with the pattern on the fabric. I f the fabric was printed lengthwise, it was easier to see the repeat of the pattern if folded raw to raw edge. But this folding was done after purchase. And sometimes after washing also.
Whenn I worked in the fabric store in the 90's, almost all of fabrics came folded wrongside out on the bolt. If you noticed wire stands next to each bolt on the table at the store, that was for the bolt to stand upright with the drape showing to the outside. I remember having to unload crate after crate of bolts that had to be draped. Finding room for the stock that came together in the same place would sometimes be very difficult. Don't miss any of that!!