Phoenix, like many 20th century American cities, is built on the assumption of 1 person = 1 car. The problem with this equation is that cars are exceptionally needy. Each car needs 4 parking spaces along with plenty of roadway to move between them. As a result, >50% of the surface area of car-centric US cities is covered in pavement. In the desert, this means hot sweltering pavement … the “fry an egg on the sidewalk” type of pavement.
The conventional wisdom is that this is just the way it has to be: That once a city becomes car-centric, it has forever locked in its density.
Phoenix is built for cars → Therefore all people have cars → Therefore Phoenix needs to be built for cars.
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.