Not all the buildings are glass curtain wall. Besides that's the predominant feel for architecture for the moment for all these towers and what the public is requesting in general now. That will change as we are beginning to see with some of the newer proposals such as the Buckhead Hilton. The mixture of periods of styels will result in a true urban character though. That's the style around the world for the moment honestly. This issue keeps coming up ever couple of months but compare stuff from 15 years ago and then stuff from 25 years ago in Atlanta. Architecture has periods just like clothing.
I live in my own little world but it's ok, they know me here!
The next time you are contemplating what the hell went wrong in your life, look in a mirror!