Having some instance dungeons like WoW is a good idea, even XI had them Einherjar, Limbus, Dynamis (honestly typical mmo instances). But this game does not need to be a nearly 100% instanced mmo like alot of mmos are doing for endgame. I would love to see something like ZNMS which where in the open world but spawned NMS, even a form of sky or sea I would welcome assuming they could prevent the botting of spawn items.

All in all it needs a good mix, of instanced and non-instanced content.