What Use Is An F-call?

What use is an F-call? In the past I've talked about experimentation. It's an activity that lies at the heart of Amateur Radio. In essence, Amateur Radio is a license to experiment. On the face of it, our license is permission to operate radio equipment on certain frequencies and using certain transmission modes, but that's an outcome that came after the experimentation. As an author on Wikipedia puts it, "Throughout the history of amateur radio, we have made significant contributions to science, engineering, industry, and social services. Research by amateur radio operators has founded new industries, built economies, empowered nations, and saved lives in times of emergency." Over the past little while I've heard some Amateurs exclaim that doing something was not allowed, or not done. I've heard people claim exclusive use of a frequency or heard them say that a proposal being made was not suitable for some or other reason. For example, there is nothing saying that a slow-scan 'net cannot be run