When I first came here there were only 4 ‘skyscraper’ off Central.
I was told that the skyscrapers were restricted so as not to obscure the view of the mountains. I am not big on “nature”, but I like a city trying to pay respect to the character of its terrain.
Also, skyscrapers create traffic issues. Phoenix has big city traffic, but nowhere near as bad as Atlanta, Chicago or DC. In fact, it is better often at rush hour even than some small cities like Hartford, and Madison (whose lake makes it impossible to use alternate routes).
People complain about sprawl, but the only alternatives to sprawl are building up (NYC, Chicago), pricing people out of your city (SF), or stagnation and decay (Detroit, Cleveland).