I think there are two questions hidden in this: 1. what mechanism should be used for transferring URIs (of uploaded files)? 2. should 0363 require that the mechanism in 1 be used?
The current de facto mechanism appears to be OOB, but that can (and should) change in the future, so it should be left open, but there's also nothing wrong with outlining what's currently in use. HTTP File Upload is a general mechanism for obtaining a URI to an uploaded file, which can then be used for 'something' - currently, the most common case is to transfer a file from one user to another (possibly multiple), but that's not to say it couldn't find other uses. A future XEP might upload one or more files and then make them available through its own wrapping (e.g. a gallery of photos), so requiring that each URI is transferred separately or with a particular mechanism seems limiting and inflexible. Some guidance on the current best practice is probably a good thing though (Informational XEP?)
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