Let's not lose the thread, please. The question was whether sideplates have a purpose.
you bring up a good point. threads should stay on topic as much as possible.
however, in the matter of this thread i think the OP's question has been more than answered and the resulting chatter is an offshoot of "plate or no-plate". i think most realize the value of the side plate is mostly aesthetic, and with that in mind the direction of thoughts and comments drifted sideways to the no-plate gun, or barn gun, and there have been some good comments as well as to "what is a barn gun?". this is all perfectly normal, educational, and helpful, i think. no?