One great thing btw is the more you shout the more I can tell you are wrong.
Consider the case
[Backbone1]--------------ethernet-----------[Backbone2]
| | |
Host1 Host2 Host3
You want all the hosts to pick the right backbone router. You also dont want
to feed all the traffic through one router first because it creates bottlenecks
as well as very bad single point of failure cases.
Alan