The length of an embassy doesn't really mean much if nothing comes out of it.
What explanation is there to give? We want embassies with regions that will help us in international affairs. If we want to contact a region, we will contact them directly, so we don't need an embassy collector. Besides, there are many embassy collectors that we could have embassies with if we really wanted.
We aren't a new region, and if we wanted to communicate with another region, we'd just build our own embassy with them. Allowing us to talk to people we don't want to talk to isn't helpful.