Siegfried explained it, we don't need more food, more roads, more houses, we need a better and enjoyable food, we need better ways to get around, we need better ways to accommodate our selves, and better in the context of the entire ecosystem not just the virtual meme we call an economy
So you (or rather Siegfried) come to decide for people what they need, right?
No, I think everyone should be able to decide for themselves what they need in a free market, assuming all externalities are priced in. Unfortunately externalities such as environmental impact are not priced in, so there does need to be some kind of science-based rules and regulations in order to ensure sustainability and the survival of life on the planet.