Basically intellect gains stat value as we stack it, but slowly. To make Intellect 2x better than mastery (so making it the gem of choice) you would have to add 17k intellect, or 107 int gems. Ain't gonna happen. Eternal flame scales similarly in that int will gradually be worth more over other stats but not in the achievable range. There is more to the post and what I did and why here.
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