This is still ignoring the argument for "more dps from the tank".
The essential functions of a successful raid group are:
1) Tank survival
2) Healers having enough heals per second AND the mana/regeneration to keep them up.
3) DPS having enough damage to defeat within rage timer / healer OOMing.
4) Avoiding raid mechanics that kill you.
If 1/2/4 are being met, then you focus on #3. As you can effectively cap on #1 and #2, and #4 is, well...random-ish. #3 is the only thing that can ALWAYS improve. The key is determining when #1 is essential to focus on and when #3 is. VIT if #1 is an issue and STR if it's not.
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