Strength, in general, is regularly spec'd at 9+1 by most experienced warriors. High strength really applies to farming/tanking builds more than general PvE.
As for sundering, I have studied the comparison of elemental and sundering sword mods, only to find that they did equal damage using the exact same build on the exact same targets. Sundering mods are overrated,imo. Anyway, I'm a Flail/Enraging Charge fan, and strength of 10 is almost a must to make the best of them. Anything higher is strictly for unique builds with heavy defense.
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