This really is amazing, but do we really need to keep building super-dense areas? I don't mean to say this isn't awesome: it is. But we have lots of unused su

This really is amazing, but do we really need to keep building super-dense areas? I don't mean to say this isn't awesome: it is. But we have lots of unused surface, and generally, building horizontally has lots of advantages: more sunlights for citizens, more room for parks, less congestion/traffic. I've noticed that places were people live more relaxed and happy lives tend to have less tall buildings, while places with more stressful inhabitants tend to be those with larger tower. More traffic, less green/sun and plenty of other factors are usually strongly related to both.