Pures not getting two sets of gear when they swap from fight to fight has always been one of my pet peeves. Most of the toons I actually get to raid with tend to be tanks or heals because most often that's where my guilds have needed the more informed players (ones who know strats, gearing, gemming, etc). As a tank or heal, you are always a hybrid. I've always had to fight to have two sets of gear ready. If we hit a one tank or two heal fight, I was usually the one to switch because my os performance was almost always even above our dps only players. This is despite having to fight just to get any priority over other minor upgrades or os rolls vs mine. In fact, most times, I don't get an os piece unitl nobody else wants it. I see those who play a pure talking about how easy it was to get gear/vp/etc and how they have all this extra currency and just grumbled inside.
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng