I read the article, and I don't understand why we're trying to solve the problem of "telling each ContainerOS to listen/respond to an additional IP address, and

I read the article, and I don't understand why we're trying to solve the problem of "telling each ContainerOS to listen/respond to an additional IP address, and route it to the correct Container" by "creating another network layer and accompanying additional complexity". In IIS this is done with Bindings.