Proven in what way? After almost 4 decades in this business, nothing is ever proven. For anything one person says is beyond discussion obvious, another person does something completely different, and gets the same benefits. Every generation comes up with new ways to do things, but nothing has even been clearly better to everyone all the time in all circumstances. You constantly have to evaluate everything that comes along, and see if it's better for you, your team, project, company or industry. Silver bullets are for vampires and the Lone Ranger.