Doubleagent is a legend though.
If someone do finish it then it would be interesting to see what kind of /played time they have on the character. It would probably take a few multiple times as long.
To me, the WoW ironman challenge doesn't make enough sense / provide a unique enough challenge. I play a hardcore ironman in OSRS which I find incredibly fun, but the rules of that are a bit different and provide a unique challenge. I'd like to see something similar in WoW, but that traditional WoW ironman just doesn't appeal to me in the same way.
Most people would tend to go hunter/warlock for obvious reasons. I could see Shaman/Druid working also, but slooooow.
Ironman challenge is personal enjoyment and feeling of accomplisment. If you like to play on highest difficulty, this is great thing. Without armory or stars this is impossible to check if somebody is legit in it. Itonman challenge is good content for stream or youtube series too.