Agreed. But I think it's a stretch to conclude that Fielding doesn't think the hypermedia principle is an important distinction between RPC and REST:
From his blog post I linked to earlier, titled REST APIs must be hypertext-driven [0]:
> "I am getting frustrated by the number of people calling any HTTP-based interface a REST API. Today’s example is the SocialSite REST API. That is RPC. It screams RPC. There is so much coupling on display that it should be given an X rating.
"What needs to be done to make the REST architectural style clear on the notion that hypertext is a constraint?"
From his blog post I linked to earlier, titled REST APIs must be hypertext-driven [0]:
> "I am getting frustrated by the number of people calling any HTTP-based interface a REST API. Today’s example is the SocialSite REST API. That is RPC. It screams RPC. There is so much coupling on display that it should be given an X rating.
"What needs to be done to make the REST architectural style clear on the notion that hypertext is a constraint?"
[0] http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hyperte...