Nature aquarium is essentially miniature aquatic Japanese garden. Diorama is essentially aquatic Chinese landscape bonsai, not a deviation of nature aquarium. Both have been around for a very Long time, but only recently adapted to aquatic setting due to availability of technology. It is actually easier to maintain a Nature or Diorama aquarium than a bonsai as the latter needs to receive a few hours direct sunlight daily, delicately manage proper moisture levels, and to winterize.It is no coincidence that the Nature Aquarium style came from Japan with their sophisticated garden tradition. Japanese gardens are sensitive and venerating human condensations of the beauty of nature. I see the Nature Aquarium style in much the same way. The diorama style is a pretty extreme deviation from this philosophy. I think there is a future need to clearly separate these styles for competions as they are not really comparable in terms of their philosophical basis. A few thoughts.
Nature aquarium is essentially miniature aquatic Japanese garden. Diorama is essentially aquatic Chinese landscape bonsai, not a deviation of nature aquarium
As said above, the time spend to create it with all the details in such small footprint and than the time spend to maintain it. It's completely out of my ball park and don't even dare to criticize it.