It's MUCH harder to overgear HM EC. At what level of gear would the amount of damage, healing and mitigation overcome the inability to tank swap on T/Z? How much armor and health would you need to survive defensive systems when someone aoe's the shield to death? How about failing to interrupt an overload in the minefield? Failing to move out of the purple circle from Breath?
I posit that there are boss encounters in EC and TfB that you simply cannot pass by substituting gear for skill. And yet, I've seen players thrilled to figure out ways to underman or undergear end-game raids because they have skill to make up the difference.
My argument is this: High gear with low skill is a dead-end. High skill with low gear isn't. Not only can you go farther, but you are more likely to obtain the gear you need for that content that has actual minimum gear requirements.
So while it is fair to say that both gear and skill are required, I firmly believe that of the two SKILL is more important.
That's what I've been saying