The benefit of a proofing basket is in the crust. The basket allows moisture to escape from the surface of the loaf which makes it more dry and makes for ta crispy crust. If you used a normal bowl, the crust would be thin and soft, and when you turn it out for baking it would either stick, ruining the shape, or you would need so much flour you’d have a layer of plaster stuck to the bread. The “skin” you get out of the proofing basket is what you see bakers cuttting through to make the patterns you see. It also makes the pretty lines you see on some loaves.