Surf your operating under a faulty premise. That threat percental modifiers on abilities are the same for both. In actuality two disparate models are used.
For Warriors, with Defiance, thats 130% base, 149.5% with talents, then static values that are modified by those percentages.
For Bears with talents that the same 130% base, 149.5% with talents, however Bear has additional percentals on Maul and Swipe of 175%. So Bear threat is 149.5% auto attack and 262% resultant threat.
Its this very reason Bear threat eventually scales beyond a Warriors threat, even with a Fury tanking build.
However I do agree with you that a well played Warrior, atm, can still out threat a Bear, but not by alot. However the caveat is that a Warrior makes major sacrifices to do so…ie sub 50 Def, far less EH, etc.
A Bear doing 300 DPS is 786 TPS…with FF use thats about 800 TPS.
With R 12/13 gear + BWL gear, a Bear can do about 400 DPS…with FF thats about 1070 TPS.
Bears exceed Fury threat in AQ 40. However Bears never have to make the level of sacrifices to achieve threat levels that Warriors have to.
By AQ 40 Bears make no sacrifice at all, tank as well as Warriors, and generate more threat.
Naxx doesn’t offer alot for Bears and as a result Warriors will take about 2% less damage overall, however Bears will never lose their EH and threat advantage.
The key is to use both classes together to swap as MT for content…they don’t compete, they compliment.
But yes right now a Fury can out TPS a Bear, skill and gear being equal…but not by much.