Bullshit. Some lasts won't fit a foot no matter how much you screw around with width and length. Sizing is really simple. Get the length right, then fit the width at the ball of your foot. If the shoe still doesn't fit, the last isn't compatible with your foot shape. People spend way too much money and time trying to find work-arounds to get incompatible lasts to fit. It's better to walk away from a so-so fitting shoe.