It's entirely possible that the extra material required to make items that can be repaired, wastes more material than making objects that are "disposable" Mode

It's entirely possible that the extra material required to make items that can be repaired, wastes more material than making objects that are "disposable" Modern manufactured goods have -huge- volumes (there are a lot of people on this planet) and low failure rates. If serviceability takes more material, it will probably be more waste, than otherwise.