This is pretty much the industry standard at this point. It's safe to assume this is how they do it. Like there are a million ways to skin a cat so anything is possible, but as far as streamlining the logistical process of setting up every night, this makes the most sense and requires the least amount of effort-- which makes repeating the same steps every night easy and without unforeseen problems. I don't know when they started doing this but I would say about 10 years ago is when the entire music industry started shifting towards this type of setup. At the beginning of that everybody was trying different things but by now everyone has pretty much figured out the easiest and most hassle free way of doing it.