Even when you use them for their intended use, such as stir frying in a wok, they can reach temperatures that are normal for cooking but unsafe for Teflon. And it is extremely easy to forget a pan on the stove for a minute, and that should factor into whether or not a product is considered safe.
For example, pressure cookers have to have fail safe mechanisms, even though you could just as easily say anyone using it should just use it properly and they wouldn’t explode.