Emergency brake delete

A parking brake would likely never stop the car in a true "emergency" situation, so there's that. Although it will help hold the car in place, especially with a manual transmission, deleting the parking brake will not somehow mysteriously make the brakes fail, or do otherwise "off the map" stuff. They will continue to work fine. It's his car and that's what he wants to do. Let him do it and go live your own lives dammit all.