You two are hoping to find a poll of the general smart-device consumer base asking specifically what importance they place on having external storage capabilities. We get it. As far as I'm aware, those polls don't exist, for the same reason that communities like Android Central are made up largely of the enthusiast crowd: the general consumer base does not have much interest in finding and participating in such polls, and most consumers who end up at sites like this (not to mention Rootz/XDA) are seeking help. We're more interested in such data than they are. The polls people have posted in this thread are obviously not representative of the true consumer relevance, but unless you find a focus group or case study done by a leading Android manufacturer, you won't find data that is properly representative of said relevance.
You can either accept that the existing data doesn't cover all the bases, so to speak, or you can try to extrapolate relevant conclusions based on the enthusiast crowd's opinions. The general consumer market and the enthusiast market are different, but they are not mutually exclusive.