++unique++ traverser for cache-busting urls does not work on static resources of filesystem add-ons

My understanding from this pull request https://github.com/plone/Products.CMFPlone/pull/1174

is that the ++unique++ traverser allows generation of unique "cacheable" resource paths.

It works for theme resources:


and for the plone static resource namespace.


Is there a design related reason why it does not work for static files in filesystem based add-ons?
For example:


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