support for resource references
It is not always suitable to download and import external resources, which are for example accessible over http: Large video collections are normally located on different servers. Another example is the reference of research publications which are already accessible over an persistent uri.
"It is important to completely ignore the fact that resources are stored as files somewhere in TYPO3 Flow's directory structure – you should only deal with resource objects."
Following this note of the documentation, i would suggest, to completely ignore the fact where resources are stored (including remote files).