Agreed, that's a sweeping statement to make on Rails scalability. Just trying to make a point though. :-)

As for Goliath - we will. Time is the scarcest resource in a startup, and that's why haven't opened it up already. We need to get some documentation in place, and remove a few dependencies.

Point is though, there is nothing inherently novel in our stack! All off the shelf pieces: thin, async-rank, async middleware, em drivers + em-synchrony.