Who needs an external on/off Wi-Fi button?

It puzzles me that there are Laptops which are shipped with external physical Wi-Fi buttons. I see no real use of it, but it might have a historical explanation?! The only time one notice the external button is when one accidentally pushes the switch off, resulting in no data connection and “the internet is lost”. So my question is simply “Who needs an external on/off Wi-Fi button?”