the once and future Spangles

[Artega]

Would you care to elaborate / be more specific? 

I don't see anywhere else he can put the available points to get greater than 4.x% damage increase + more rage for specials, not quite as nice as the gain from something like 2H spec, which is a straight 5% + rage, but I see it as the best option for points beyond flurry and BT.  The impale line is less than half the damage for the same investment.

I simply don't see how you can consider these a waste of points, as I see no other option that will add even close to the amount of damage that DW spec does.
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I'll be more specific. Dual Wield Specialization will give you more DPS (going by Rishana's build, in the article linked by the OP), but you're losing Improved Execute (easily one of the best talents in the Fury tree), Improved Berserker Rage (the old version was far better, but the new version is still kickass), and aren't able to get 5/5 Improved Battle Shout (not that 5% is going to make a huge amount of difference.)

As for Rend vs. other options, I simply find Rend to be a massive waste. It lasts 21 seconds at max rank, which is 21 seconds where you will be completely unable to try to pop a Fear for a bandage mid-fight (which is also why I don't pick up the Impale line with my Fury builds.) Second, a Heroic Strike is (relatively) instant damage, while a Rend does less damage over more time; you might not always have 21 seconds in PvP, and 21 seconds is a lot longer than I'd prefer to kill a single mob if I'm grinding or farming. Additionally, Rend does not do initial damage; how can it crit, proccing Deep Wounds? You also mention Rend generating Rage - it doesn't.