I asked on reddit if anyone hunted down treasure map locations without assistance (addons, websites, etc), and the response was predictably that almost no one even attempted to do so. Personally, I like hunting down things like this, but even for me, the images these maps give you are just too difficult. Maybe it's because they're images of scenery rather than linguistic clues. I don't know, but I'd like suggest that linguistic clues in the vein of skyshard clues be added to the maps to make it more practical to hunt them down but not as trivial as adding pins on the regular map as was done with skyshards.