It's been my understanding that the turn-over binding was rather simple and traditional ..... and the first choice at the time of assembly if there was sufficient backing material to do so .... those edges get a lot of handling, wear and tear, and at that point it is easy to trim and get to unworn parts and THEN put on the separate binding and have a fresh-looking quilt .....
When putting on the separate binding, I was told to do the side bindings first, and then the top and bottom bindings - as the top and bottom bindings wear faster. It is easier/symmetrical to refashion only TWO cleaner, crisper new bindings and not have to do all sides of the quilt AGAIN ....
Makes sense .... but since I started quilting at a later age, I will probably be long-gone before any of my bindings have a need to be re-done :lol: