RAM galore
To manipulate large geographic data (digital terrain models, Lidar meshes, etc.) and work it carefully into a model of the terrain, roads and so on in a Blender or Unreal Engine project, frankly 128GB is not to be sniffed at (and it gets full very quickly, so we can't wait for 256GB to be made available to the general public!)
I'm very satisfied with this purchase, which has more than paid for itself!