Just like I know what it means to be a Christian, and I think I know what it means to be DIR.... Just like the different 'flavors' of faith - I'm not going to nitpick which variants are saved and which are not.
In no specific order and off the top of my head....
1. Surround yourself w/ competent divers.
2. Donate the long hose - and don't allow anything to get in the way of making donation possible.
3. Utilize standard gases appropriate for the depth range.
4. Shape the ascent to ease the stress on your body.
5. Situational Awareness.
6. Never stop diving.
7. Take what you need - no more - no less.
8. Use gear and techniques appropriate for the environment.
Good list, Tim.
But I think it makes my point. You have your loose, off the top of your head definition, and I won't quarrel with any of it. But once DIR becomes, "this is what it means to me," then it no longer has a universal meaning. (And I don't think that's bad.)
[BTW, diving with you years ago had a lot to do with my own path toward DIR diving. You were the first DIR diver I had ever met. I didn't know much about it then, but you were clearly a better diver than I was, and I wanted to know more.]