This feels like a terrible idea. "Fixed URIs"... it just sounds wrong in a hypertext driven ecosystem. Must be a better way. Why couldn't this be addressed by defining good site-* link relations?
RFC 5785: Defining Well-Known URIs: "
This first piece of the discovery stack was published today as an RFC. RFC 5785 defines a registry for new well-known URIs which will provide a standard location for the host-meta document. This work started a year and a half ago as a well-known document called /site-meta, and slowly evolved into a simple registry. While this isn’t a breakthrough idea, it does codify existing behavior and hopefully encourages people to share ideas, discuss proposals, and reusing existing well-known URIs.