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I am very much against it, since you no longer can send to Russia "I told Germany that..." and to Germany "I told Russia that...", when the messages are totally different.

You describe it as effectively it would just be Public Press within a smaller player set, but you could still send individual messages to those nations. The key question is "why would you want to send a message to two rather than two messages to the individual", and I suppose the hope is that if two people see your intentions, you've got two guaranteed enemies if you break your promises. A kind of social coercion, but nothing that can't be done via individual messaging. I don't see a problem with it, unless it entails giving up your individual messaging capabilities