Mate, you are a good game, right? This means you already had fast reactions. And you are at the peak of your capabailities.
http://journals.plos.org/plosone/art...l.pone.0094215
TL
R each year past 24 your reaction times drop.
We are just defining what effort is here. Effort is not 15 minutes of skill work. its hours of repetition.
We just said this, its to do with the numbers of players you had to take. Loads of people who had stable 10 man rosters who had no intention of going further than normal or maybe heroic suddenly found themselves 5 or 6 players short to get anything done. All at the same time - because everything was set up to make mythic 20 more viable.
The usual "you had a year to prepare" stuff doesn't apply to this - because they had no idea that small group raiding has been shot in the head until they got to highmaul.