I am actually not disappointed. In fact, I will be elated if most people regard the S5 as a prosumer camera. As you know, I own a S5. When newbies ask me about my camera, I always refer to it as a prosumer model as it immediately conveys the message that the camera is somewhere in between a simple consumer model and a complicated professional model. But I think we are in the minority.
There is no universally agreed definition of what constitutes a prosumer camera. Some people (like you, me and some people in CS) feel the S5 is a prosumer model. Others do not think so. What I am saying is that the majority of people who are apparently more knowledgeable do not regard the Canon Sx series as prosumer models. Only the Canon G series qualify as prosumer models. Even then, some people think the G series are still not prosumer models. They refer only to the entry level Canon dSLRs as prosumer models. If you look at reviews in reputed websites such as dpreview, you will see them referring to the Sx series as compact cameras, or ultra-zoom compacts to be more precise. The prosumer label is used for some other cameras.
Perhaps, we should call the S5 a prosumer compact?