Why do you guys tell others what they can or can't hear? We need to have someone do head surgery on you and implant a device to detect signals between your eard

Why do you guys tell others what they can or can't hear? We need to have someone do head surgery on you and implant a device to detect signals between your eardrum and the brain to see what's heard. Even then the brain probably has a lot to do with how sound is interpreted or processed.