The biggest advantage I think they would get is a central configuration through all their routers. No need to have a complex interdependent configuration on a d

The biggest advantage I think they would get is a central configuration through all their routers. No need to have a complex interdependent configuration on a dozen routers. One controller can forward the changes to everyone when their made. Also my knowledge here is limited, but I was under the impression that if I added additional routing bandwidth the system would learn about that and automatically make changes to the routing tables to utilize the additional bandwidth ?