I think I'm being taken too literally, sure you can probably groom most things but if it is a true black diamond then it should be steep and mean and ungroomed and left to those who can to figure it out. Perfectly manicured, mellow 'black' runs are just kind of sad and desperate marketing for wannabes. If it's not that steep then it can still qualify if there are rocks, trees, narrow, bumps etc to provide some natural challenges. They shouldn't be taken away.
I think you're missing the point... there is no such thing as a "true black diamond". There are small mid-western/southeastern/mid-Atlantic resorts where nothing would qualify as more than green at a big mountain. But they still have green, blue, and black runs - that's correct and how the system is supposed to work. The definitions are not absolute and are only about relative difficulty at that resort. Many resorts (including some I ski) don't have rocks, trees, narrows, or bumps - that's reality.
And even if you use a more big mountain based definition, I love groomers and steep black groomers. What's wrong with them? People enjoy sports in different ways. IMO, it's probably helpful to let everyone enjoy it in their own way. I don't know why it has to be sad - is it sad that I like steep groomers?