Professor - it's not about trying to apply the guidelines to pidgeonhole a commercial beer, it IS about eventually UPDATING the guidelines to reflect the beer for which they were developed. Without someone noting and pointing out particular commercial examples and attributes there would never be change. Same goes for trends at homebrewing competition, if people are brewing and entering Black IPAs it is certainly worth discussing adding the style when the guidelines are revised. I remember suggesting Freeminer Deep Shaft to be added to the FES style the last time the guidelines were updated, I believe it was already in the works, but IMO the feedback helped those working on the guidelines to enact the change.
Let's take the wayback machine to the 1999 guidelines...how does the diacetyl level appear...http://www.bjcp.org/styleguide16.php
Aroma - low to none
Flavor - medium to none
Sounds about right to me when describing the Guinness FES which is now distributed in the US based on the 4 pack of beers I purchased.
Anything else ya wanna stress about Professor