Perhaps you lost track of the topic somewhere along the line. DADGAD is a well known and very popular tuning and it's talked about here on the 'Cat and elsewhere at great length. No one here is suggesting that DADGAD is weird or even remotely new to most of us. It is probably the most popular alternate tuning around.
The original post here was on DAGDAD which the poster was experimenting with and a few folks have questioned it's viability. Ted asked what the experience and motivation for the tuning was after Murray suggested it was "useless."
I'm curious too and wonder what it works on so well because I tried it both tuned up and down and didn't find it sounded great in any application I could think of, but then again, I don't go nuts over alt tunings all the time either....some seem to use nothing else. I think there may be a time and place for everything....so where does this work so well?