To me the devil’s in the details. Many many observations like this won’t have exactly the same coordinates. Earlier today I took photographs seconds apart with my phone: one of a monarch, one of the milkweed it was on, but both photos don’t have the exact same coordinates or the exact same horizontal accuracy. So what would the thresholds be here?
And if iNat does this for observations that don’t have the exact same coordinates, that would likely necessitate extra calculations when loading the map.