Clemence wrote:Charstone in village, HF in the mine, free teleport between both like HF and village in legacy.
If I remember right charstones were made to stop this abuse.
No longer being able to port to village idol was the change to stop such abuse, charter stones were simply re-added in a modified form of their previous version because players wanted an easier way to trade with each other across great distances instead of being required to travel for a number of hours.
However, you aren't wrong that they could be used in that manner so maybe limiting to porting from village idol only could be a possibility. Would still be possible to port from idol underground to charter above ground but requires much more investment than a hearthfire.