A proper standard for syncing rss? So that, like email, you just have to point your various clients at the address of the sync server you are using. That can be one you run yourself or one from some third party provider. If your provider closes you can just point your clients at the new service, without each client needing to implement a new custom API. You are also free to use whatever client(s) you want. It seems to me like this should have been part of RSS since the beginning.
The web community seems disinterested in developing standards other than presentational ones (HTML/CSS), I guess largely for commercial reasons: the creators of services want to lock you into their specific (magic hip RESTful JSON) API.
Five years ago, if you wanted to show content from one site or app on your own site or app, you could use a simple, documented format to do so, without requiring a business-development deal or contractual agreement between the sites. Thus, user experiences weren’t subject to the vagaries of the political battles between different companies, but instead were consistently based on the extensible architecture of the web itself. -- Anil Dash [1]
[1] http://adactio.com/journal/6291/