I agree that the Blights event is probably the rarest one to get to turn heroic. I think the problem is that it's the hardest to be able to see what other players are doing to turn it heroic. Glimmer drill : you can see people shooting the machine Servitor is a problem only if people kill the mini servitors too fast and it bugs the big one in immune phase. The big cabal ship (don't remember what it's called right now ) you can see people shooting the vents The ether harvester / scorn one in Dreaming or Throne world, you can see people popping the blue flying orbs. The escort the platform one, you can see people throwing the gold orbs. Brigs : you can see people shooting the little flying things Vex: stand in the rings and kill stuff. For Taken Blight, I don't think most people would recognize that the mechanic is to step in and out of the small blight domes. It isn't a visible enough mechanic as something out of the ordinary. It just looks like the player who knows what to do may have a weapon on that works, (like trying to stun a champion), while the other person doesn't. There's no visible change to the player when they step in and out to show that a mechanic was triggered. The movement just looks like regular movement, maybe trying to lure ads out of the blight domes. Unless people are bothered enough by not consistently getting it heroic to go find a video, this isn't going to change. Compared to the others, Taken Blight is a very, very subtle mechanic.

Wardcliff coil makes it heroic in 4-6(?) shots. Been a while since I swapped to Choir of One.