Stacking Threat Reduction

[Skandranon]

For some bizarre reason, Daelo, one of the Blizz game designers, decided to answer a fairly random question in the raid forum. 
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The original question, of course, was whether the Netherwind 3-piece bonus actually functions. His response was one of the worst Blizzard non-answers I've ever seen, which is that yes, it reduces threat equally across all levels. Tests that show rank 1 frostbolts with the bonus having full threat reduction and rank 10 getting less than 1% threat reduction thus show the bonus working as intended. Daelo says that the "way the AI uses threat is a secret" and since we don't know, the fact that people with and without the bonus get aggro at the same level of damage is fine.

In short: it reduces some internal value of threat, but not the likelihood that you'll draw aggro. Shorter version: doesn't work, we don't want to fix it.