| imho the real advantage is that areas will have four walls, and hopefully the camera can rotate around if need be, i'd not mid having zoom capability either.
in some of the ie games problems arose where a char would drop something or die "behind" a wall and locating their gear became a somewhat painfull excercise, or if really unfortunate items were droped infront of a chest or the like and were then "unclickable"
3d could also allow for vertical movement (as you implied) or stuff like flight / levitation, climbing, falling (real pit traps) ect.
in addition i would think it makes maps / areas easier to render on the design side allowing for more complex areas and less recycling of whole maps.
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