Ask HN: Are digital twins the future of urban planning?

Recently I've read a lot of articles how digital twins are the future of urban planning. I see that it may helps decision making in a way but I fail to understand why there aren't many cities using them already. I'm coming from the game industry and I can see that everything is available to create digital twins in a scalable way, google earth 3d data, mapbox data, public data, etc. It almost feels like it's a new buzzword or hype for companies to raise a lot of money without actual value provided.. What do you think?