Name me one interview method that actually has better results than that? Okay, lets eliminate the ones that are obviously unqualified from the ones we paste up, is your method still better?
Most people interviewing honestly have no reason to believe they have a better method. There has been a fair amount of scientific research about how to select good employees, but none of that has made it to the people interviewing. I don't know much that will help, but HR really should be finding scientific basis for how to interview and training people on that.