DHH's API philosophy (send simple JSON serializations over the wire, mostly from the server to the browser) got him through the 2000's OK, but the longer he argues against hypermedia, the less relevant Rails becomes for API design.

These are not particularly good arguments he puts forth here. I believe they are in response to Mike Kelly (designer of the HAL+JSON hypermedia format) and his recent post: http://blog.stateless.co/post/38378679843/hypermedia-apis-on...

DHH's comment that URLs instead of IDs are a good idea is true (but he even gets that part wrong in how he implements it, leaving a '.json' extension on the URL). And the rest of the article is trying to hand-wave away the value of hypermedia (links -- all hypermedia means is links, at its core).

And comparing HAL+JSON, a blessedly lightweight standard, to WS-* is just dirty.

This post didn't convince me of much other than that DHH may run out of steam on this issue before too long.