I see in the affliction sim
does it mean that you use soul fire for this spec ? With the new patch, these talents shouldn't be reached by affliction tree.

Soul Fire still has greater DPET than Shadow Bolt and should still be used for Soul Fires until the boss reaches 25%. I would save one shard though, if you're specced into Soulburn: Seed of Corruption.

If you need simcraft to tell you that your +hit scale factor beyond 17% is zero, then perhaps simcraft is not for you. Reporting zero tells me no information I did not already know. Therefore I prefer its current model of reporting the impact of decreased hit. Even that is marginally useful, because as long as hit > crit, haste, mastery, there's no reason any reasonably geared raider should be below 17%.

The sentence says the scale factor shows the DPS loss per unit decrease. So not every point of hit after cap worth 2.1, every point loss costs 2.1.

Sorry for my awful english.

I don't know if it's been mentioned yet but at higher int and crit (and so pet crit) levels destruction efficiency hits a point where lifetap is completely removed from your rotation.. I've found this to be already achievable with the darkmoon card: volcano, especially if you save your soulburn+SFs a few seconds at the start of a fight for the trinket to proc and so increase the mana gained from the soulleach proc. what's even better is the CD for both the trinket and the spell line up so perfectly that with the high proc rate of the trinket you can use soulburn near instantly when it comes off CD to get the same damage and mana bonus as before.

Scalefactors are a linear approximation of the actual DPS function in the following way: (I'm taking your example of T11 BiS to have some numbers)

DPS(base_gear + extra_stat) = DPS(base_gear) + SCALE_FACTOR_stat x extra_stat

For haste, scalefactor = 1.5611, this gives
DPS(base_gear + haste_difference) = DPS(base_gear) + 1.5611x haste_difference

For hit, scalefactor = 2.1775, this gives
DPS(base_gear + hit_difference) = DPS(base_gear) + 2.1775 x hit_difference

Simcraft calculates these linear approximations by simulating, for each character, a profile with some (I believe the delta is 100 but i might be wrong) statpoints more than the base profile provided by the user. For hit it just calculates a profile with 100 points of hit less thant the base profile.

You claim the scalefactor of hit should be negative, but that would mean getting more hit would lower your dps. In the case of loosing dps by loosing hit, the hit_difference value in the formula would be negative, not the scalefactor. For hit-values higher than the hit cap, this linear approximation is obviously no longer valid, nor do we need it to be.

As confirmed as PTR gets.

Here is the link to the post: An Analysis of Future Warlock Changes - Forums - World of Warcraft

Furthermore there will be more changes posted later, so let's not cry wolf and wait what they will offset the 15% haste loss with. I doubt they will just simply take it away and call it a day.

I think it's a common misconception, one I've made myself, but it's worth noting that the scale factors do not claim to provide any information about what happens if you lose haste: if you check the screenshots posted earlier you'll notice that it says:

So the scale factors presented do not tell you anything about what would happen to your dps if you lose 40 Haste, in just the same way that they do not tell you anything about the effect of gaining Hit (whether at the cap or not).

He's banned for the next 24 hours so everyone can stop replying to him now. And no, that's not just a suggestion.

First, the Scale Factors don't really claim anything, even tough it seems more and more a big failure to make them public to people who don't understand what they fully represent.

The Scale Factor Numbers are like Innulock explained a linear approximation. Very important to note that they are themself numeric approximations, and due to the numeric calculation of the dps function they can be quite imprecice.

Actually the Scale Factor's in simcraft represent partial differential quotients of the dps function.

Scale Factor ( Stat ) = ( Simulated_DPS( Reference Gear + Delta( Stat ) ) - Simulated_DPS( Reference Gear ) ) / Delta( Stat )

The default Deltas found in sc_scaling.cpp are 300 for (Int, SP, Haste, Mastery, Crit ) and -300 for Hit Rating.

This is what Scale Factors exactly represent in simcraft, nothing more and nothing less.

Keep in mind that there is always the possibility to run your own simulations to get numbers you desire. There are many options for the scale factor generation.

positive_scale_delta=1: Set's the Delta for Hit/Expertise from -300 to +300, exactly what Alduin wants.
center_scale_delta=1: Scale Factor( Stat ) = ( Simulated_DPS( Reference Gear + Delta( Stat) / 2 ) ) - Simulated_DPS(Reference Gera - Delta( Stat ) / 2 ) / Delta ( Stat )
five_point_stencil=1: similar to center_scale_delta with 4 neighbor points.
scale_delta_multiplier=X (X > 0): easy way to multiply all Deltas together.
scale_lag=1: option to generate scale factor for lag
scale_crit_rating=N: and similar for every other stat you can modify the Delta for a certain stat.

I hope this helps clear things a bit. The most important point that many people never understand (especially in the old simcraft warlock thread) is, that Scale Factors ( or linear approximation in general) are only "exact" in a neighborhood of the reference gear used in the simulation.
Another important point is that the dps function when changing haste rating - for certain specs like destruction - isn't really continuous anymore. This is also always a big big discussion, especially because many people don't understand that the scale factor's are calculated with such big Delta's.
Or the put it in another way: Don't overvalue the Scale Factors, in the end you always have to compare gear by running two different simulations, only this can really show which one is better.

It will make fel flame worth casting, but it doesn't look like it's a great set bonus at all - looks like it's worth about 120 dps for affliction, 140 dps for demonology, and 170 dps for destruction.