I think part of the confusion arises from classification names vs common names as well. Would Autumn Joy be considered more of a common name? I'm not sure either way. At least with trademark names or 'pp' numbers you're identifying a specific plant strain and it is the original (named) version of the plant. I could see the argument for Autumn Joy not being included if the moniker was applied later, however, just because it's "the name by which it's sold in English-speaking countries" shouldn't discount its importance. This is an English-written forum after all. If Autumn Joy is applied to that specific plant variety only, I could see Bonehead's argument for its importance in the listing as well.
Regardless, what I certainly do appreciate is that standards for consistency have been set for the database, no matter what the rationale is.