Exactly. Thing is, if it doesn't work then what happens? You get a message on the display saying "stop&start unavailable" and the car just doesn't stop. Hardly the biggest deal in the world? I just don't get why people get so worked up over it. It's not like the ABS not working or something going wrong with the suspension, both of which are safety issues.
Because people have paid a lot of money for the car and have a right to expect features which are selling points to work. I seem to remember you took your car back to have sagging leather replaced under warranty and that wasn't a safety feature............