Trees should block a player's view when waving their mouse through them. This would add a dimension of realism to the game. In PvP, a player can not hide in a forest, simply because the other players can wave their mouse cursor around to see where in the forest the hunted player is. In PvE this would add realism and could help a shy player evade someone chasing/following/harassing them. This effectively gives us x-ray vision. We can't play hide and seek. No playing cat and mouse.