I understand all your points, Mama. The one problem, however, is that most people do not have access to food-grade plastic bags that are large enough.
When using cling film it is loosely wrapped over the dough, precisely so there's room for the dough to rise. If you press down the edges, as you would when sealing food in a bowl, then the problem you identify prevails.
The real advantage of using plastic bags, when they're available, is that it guarantees the dough will not pick up stray odors and flavors from other things in the fridge.
One of these days I'm going to have a fridge dedicated just to baking. And a wood-fired hearth oven. And a.......
At any rate, the beauty of letting the dough rise in the fridge is that it's a slow process. Several things happen to bread dough when it goes through that delayed fermentation process. First off, the gluten strands really have a chance to develop. Second, and perhaps more important, there is enough time for enzymes to do their thing, converting starches to sugar. This makes for a deeply mellow tasting crumb, and a beautiful crust. Crust is a function of surface sugars caramelizing, of course, and the more sugar available for this the better.