I would like to see why actually Heroku fell back to random routing. It doesn't really make sense. Of course this all routing stuff is really tricky, but on the

I would like to see why actually Heroku fell back to random routing. It doesn't really make sense. Of course this all routing stuff is really tricky, but on the other hand there is a lot of work done (look at TCP agorithms). When I was studying ZeroMQ routing based stuff for one project, I came across "credit-based flow control" pattern, that could make perfect sense in this kind of situation (Publisher-Subscriber scenario). Why not implementing such thing?