It's in response to Rails being on the trailing edge of Hypermedia/REST API design, and not making moves to pull ahead. Rails's strength is in its sane and pow

It's in response to Rails being on the trailing edge of Hypermedia/REST API design, and not making moves to pull ahead. Rails's strength is in its sane and powerful defaults; the absence of a sufficiently sane and powerful default for API construction is a hindrance (especially now that ActiveResource is getting booted from core Rails). DHH has simply never taken REST/Hypermedia seriously as a design philosophy. He, and Rails, have been content to move simple JSON serializations over the wire and leave it at that. This was good enough a few years ago, but is getting to the end of the runway for the present and future.