[aaron695]

The article mentions it also "protects the port of Copenhagen"

But otherwise it steals value from the city and it increases the coastline.

Increasing the coastline is truly adding to society, humans value water access, but I suspect the stolen value by shifting the centre of mass of Copenhagen obfuscates it's true added worth.

It's quite different to building up or down or abstract improvements like tunnels which increase density and more clearly add more than they take.