This sounds good until..........
The sharing of gates sounds good until they have you run from Concourse A to Concourse G in 20 minutes to make your plane and you are at the last gate of Concourse A and need to be at the last gate in Concourse G.
We learned about sharing in preschool and yes its good when it works but if an airline keeps moving you around sharing seems to make it hard on the passengers. Now if they kept the same terminal/concourse then that is fine with me.