Originally Posted by kalbear
The assumption is that non-parry hasted hits do not kill tanks under most circumstances. Even a string of hits that aren't quick will not kill a tank; it'll make healers work harder, but it won't kill that tank. Heck, you say this yourself in the previous paragraph about tanking teron.
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Teron is a bit different from most Sunwell encounters. There are very few encounters I can think of where 2 hits in rapid succession are going to kill a tank and most of them are in Sunwell. It takes a number of hits to get you to the point that you are going to get killed from a faster mob attack speed and avoiding any hits in that series makes it possible for healers to get you topped off so the parry flurry or subsequent attacks aren't a threat (this is particularly true if you have a druid healing you).
If you don't avoid void sentinel hits on M'uru, you're going to die - one and a half healers cannot keep up with every hit connecting. It doesn't matter if those hits are coming because of parry flurry or not; it's a simple question of healing throughput in a tightly tuned encounter. If you don't avoid one out of four hits during stomp, you are probably going to die (partially a moot point since Brutallus doesn't benefit from parries). If you don't avoid any hits during corrosion, you're going to be in serious trouble or pull too much healing off the raid. The burst in the Kalecgos encounter comes because you're stunned, it has nothing to do with your swings or lack of avoidance.
The argument is mostly academic however. You don't have the option to gem for expertise instead of avoidance. I'd assume you wouldn't ever equip something like shard of contempt over moroe's pocketwatch in a survival fight. Likewise, pendant of the titan's is clearly superior to the badge reward neck for survival. The reality is that you only have so many options for expertise gear and most of it already has a lot of avoidance on it.