++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:

++theme++my.theme/++unique++xxxx/style.css

and for the plone static resource namespace.

++plone++static/++unique++2018-02-09%2011%3A16%3A34.940752/faceted-navigation-jquery.min.css

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

++resource++my.addon/++unique++xxxx/txbizlaw.css

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