Cities have nothing to forage within them. Adding some small things to forage would encourage people to explore the city more.
I think there are a lot of reasons to explore the cities, though I do agree with your suggestion that they should have some sporadic gathering materials. I was just bouncing around in Lion’s Arch in the SE fields for a long time while I looked for that Vista, and thought how strange it seemed that there was nothing to harvest up there.
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