Really, finding a few examples of 7000k hour violin players discredits the 10k hour rules? It's an estimate, not a mission to mars.
Are you also offended by astronomers getting the mass of a star, or geologists measuring the amount of oil in a well wrong? They would be delighted to get the order of magnitude right.
Are you also offended by astronomers getting the mass of a star, or geologists measuring the amount of oil in a well wrong? They would be delighted to get the order of magnitude right.