It'll get there. Given how much land there is, and the price of such land, its cheaper to just expand than it is to build upwards. But the city itself is still relatively young. It will have its mid rise/high rise boom eventually as land becomes tight. Although Phoenix is really a huge blunder on the part of urban planning. If only they had focuses on smart policies from the beginning and if it didn't mindlessly sprawl. It sucks because I would really have liked it if it was efficient.
