Notwithstanding what I said above about risky assumptions, and about being able to override the list of options offered, at least having a different list of places for each dataset makes a bit more sense than the apparently universal list of places at Ancestry. I frequently get frustrated when doing a search there in, say, the Gloucestershire marriages dataset, that when I start typing in the parish of interest, I get suggestions of places in China, the US and almost everywhere in the world except Gloucestershire!