A big of a long-off goal with the indieweb BDD specs, would be for it to be a generic way to automate how many of the features of indieweb a site had implemented.  Kind of an automated IndieMark.  But really, just something to give you an idea of which features you could choose to implement, and which ones you’ve already implemented successfully.  It should of course be implementation agnostic – it’s just testing functionality after all (the point of BDD).