well because somone from cipsoft said some months ago only 30 % of all quest is known.That's why...
So that means there is an uber cave somewhere? it can just be an npc quest or something like that, almost all the "chest" quest has been done or spoiled. But you have a point there is probebly some places where nobody/a few have been to(poi before 7,8 update), but what is the big deal im pretty sure you understand what ppls mean whit 100% map all the places players use to be on, in the real tibia servers.