Stereophile spec measurement baffling(pun?)

Usually to help define woofer roll-off.

The industrial standard should have always been -3dB or -1.5dB. The perceived sound level drops 19% at -3dB instead of 34% at -6dB. More restricted tolerance is -1.5dB, where the perceived sound level only drops 10%, making it more appropriate threshold for defining roll-off tolerance in anechoic room setting.

At least they still take measurements unlike Absolute Sound. I don't think measurements are the final word in a devices sound and hate ASR. Power out measurements and speaker sensitivity are both important to me.