>But changing to two time zones? How is that better than 4?
Jet lag for one thing. Flying from LA to NYC currently sets you back three hours. It will wreck your sleep schedule and leave you tired for three days. Change to two time zones, and it will set you back one hour instead, which is essentially the same effect DST has. You might be slightly tired, but you'll recover within a day.
Another benefit is communication. Communicating with people in different time zones is a pain, and the more time zones between you, the worse it is. With only one hour between them, you greatly increase the overlap of when people on different sides of the country are able to communicate.
Jet lag for one thing. Flying from LA to NYC currently sets you back three hours. It will wreck your sleep schedule and leave you tired for three days. Change to two time zones, and it will set you back one hour instead, which is essentially the same effect DST has. You might be slightly tired, but you'll recover within a day.
Another benefit is communication. Communicating with people in different time zones is a pain, and the more time zones between you, the worse it is. With only one hour between them, you greatly increase the overlap of when people on different sides of the country are able to communicate.