A fair point. I was referring to the api being separate from the frontend, not what the api is returning. But I could see someone designing their application the way you describe.
If a resource or result is addressable it means that a 3rd party can build an API that integrates with my API and link straight to results of certain queries.
Granted that this would be hard in the context of the dropbox API, because they already 'break' a lot other rules.