Originally Posted by
reckoner04
You need it if you're playing at your personal skill cap and still can't beat a boss. You're basically saying that you have to improve your skill/performance every encounter if you want to beat them. That's not true, skill/performance and gear both factor into whether you beat an encounter or not, and skill/performance can be seen as constant in comparison to quickly changing gear.
Whether there's someone else who can beat an encounter with lower gear isn't even relevant. If you can't beat it after several tries, you have to get better gear since increasing your skill cap is unfeasible (maybe not if it's your first month of competitive raiding).
Therefore, gear improvement equals progression. That was his argument, I guess.
I used the term progression from a long-term perspective. There are of course feasible performance gains while learning an encounter, but that's short-term. We're looking at the performance after you've learned the encounter, since we assume Heroic to be tuned in such a fashion that learning an encounter is an intended part of the experience (in contrast to LFR).