SE announced they would be eliminating the penalty to TP/hit that is caused by excess Dual Wield in the September update earlier this year. When it didn't arrive in September, I assumed that it would be in the October update and didn't say anything. Now it's October and there's no Dual Wield adjustment, so where is it?
For those of you wondering what I'm talking about, delay reduction is limited to -80%. If you have capped magic haste (448/1024) and capped gear haste (256/1024), you have 68.75% Haste and need 36% Dual wield to hit the 80% delay reduction cap.
(1-(448+256)/1024)*(1-X) = .2; X = 0.36
If you have 50% Dual Wield instead, you still only get an 80% delay reduction. The problem is that Dual Wield reduces your TP/hit, so you want to use as little of it as possible. For most jobs, 36% isn't such a problem. Traits only go up to 35% Dual Wield (Ninja, level 85), so jobs can just stop using Dual Wield equipment in situations where they are pushing up against the delay cap without it.
That is, until you use Haste Samba. With Haste Samba, the math becomes:
(1-(448+256+101)/1024)*(1-X) = .2; X = 0.065
So if you're using Haste Samba (5/5 merits), you only need 6.5% Dual Wield to hit the delay cap. So you suffer a pretty substantial TP/sec penalty for having Dual wield that you don't need, which is (ironically) worse the more Dual Wield traits you have. To be clear, you are not getting less TP/hit than you ever do without DW gear, but if you had much less Dual wield you would be getting more TP/hit and swinging at the same speed.
Taking Dancer as an example, adding Haste Samba on top of capped magic/gear Haste allows us to drop 6% Dual Wield in gear without leaving the delay cap, but offers no further benefit. So Haste Samba, which must be maintained, costs us 350 TP, and so forth, lets DNC use Windbuffet Belt +1 instead of Shetal Stone. That is the entire benefit.
If they had made the changes they proposed, Haste Samba would have increased TP/hit for Dual Wield jobs. It still wouldn't have really reduced delay very much and it would still be smart to swap Windbuffet +1 for Shetal Stone, but I would also have gotten a lot more TP/hit (21%, +11 TP/hit for me) for having it up.
tl;dr:
It looked like they were going to give Haste Samba a useful buff as the only source of JA Haste that affects Dual Wielders. Two updates after their implementation date, it's not here. Where is it?