I have a slide switch on my Dell laptop to turn off wifi. I've never known anyone to use it. (Not to say there isn't a use, but rather to say that a major vendor puts it in despite that the average customer would not use it, and it doesn't seem to break.)
We had similar laptops in a clinic where I worked a few years ago. The hardware switch for wifi caused hours of confusion and many unnecessary calls to the IT service--I never understood the use-case. Is there one?