The difference is Pareto efficiency on the (time,quality) axes. Circles and then epicycles were the best model ever known until superseded later by ellipses. St

The difference is Pareto efficiency on the (time,quality) axes. Circles and then epicycles were the best model ever known until superseded later by ellipses. String Theory is not the "latest and greatest" , it's latest and less good than it's predecessor, making it useless as physics.