> I take it from the this and the prior post that the expectation is
> that pubsub nodes are hosted by the server controlling the JID that
> owns the node, which makes sense.

not necessarily, 
* if your server runs no pubsub component you can use pubsub services from
other federated servers
* If the server runs a pubsub component which is not build into the server
directly, but used the XMPP component protocol you have no roster access.

I see your points, maybe you should also take a look at PEP (XEP-0163)
which interacts with the roster.
I like your ideas, but to make this happen we need first a new component
protocol which gives us access to the roster. Otherwise we will have no
portable pubsub components or addons.

Alex

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