Theres no option for none
who would buy a bike the size and weight of a GS and not put panniers on it? what's the point in owning one except to do something that requires luggage of some kind?
The assumption is that as a GS owner you are doing miles and touring therefore you have luggage, if that were not true then surely that person would be riding a smaller more nimble more fuel efficient motorcycle?
Conversely anyone who Does have a GS and just uses it for pootling round town obviously does not have an opinion worth listening to, so again pointless option.
its just a guess