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While it isn't a linear fuction, it is incredibly close to being one at almost any level of gear - the smaller the gear level gap the closer it is to being linear. In practical terms, damage VS crit is very very close to linear I would never really bother checking if their ratio changed until I upgrade to full T6 or something... Upping my spell damage from no pots to flask+food+wizard oil (all add flat spell damage) the crit->damage conversion value only changes by ~0.02 (or less? I forgot). This is nothing and the different of sclaing of crit vs damage at different gear levels can be almost safely ignored.
So yes, you can say 4 crit is inferior to 5 spell damage and if you are correct for him (which I bet it is for shamans too), it will be correct for probably 99.9% of the raiding shamans, and the 0.1% remaining shamans probably suck anyway due to having some kind of extreme gear setup which would only be possible with crappy gear...
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