I don’t know. I was running my druid through keys just to get used to Guardian again as an old resto player. There was a DH doing half of MY damage. I kind wish he would of been using this one button thing. 
In all seriousness though, I find this whole thing ridiculous. I don’t know what Blizzard’s goal is but this just seems like the weirdest thing to do. Do other MMO’s do this? Are they just trying to have a shiny new thing to claim? What is the purpose, honestly.