I think the federation part of this post is kinda ill-written. BGS is more of a proxy for messages in PDS, and not critical for federation itself. It's somethin

I think the federation part of this post is kinda ill-written. BGS is more of a proxy for messages in PDS, and not critical for federation itself. It's something additional to the federation network, but still necessary to build a user-friendly application. In other words, it belongs to application layer, which is above the federation layer. I'm pretty sure this is the intent of the design.