Originally Posted by
Muphrid
I'm trying to point out that this multiplicative behavior is not unique to haste; the only reason you can say "haste scales itself" is because we typically call haste rating and haste procs both "haste". If we called haste rating "haste" and the outside procs "casting speed procs", you would not be able to say this, even though they both affect overall time needed to execute actions. As far as scaling goes, they are entirely separate phenomena.
This statement in particular concerns me:
The only way I expect an average person to read that is having to do with haste rating. It's the only thing a person can control with their routine gearing decisions. Furthermore, the relative value of haste (which is particularly relevant for deciding to gear haste rating vs. other ratings) does not change nearly as strongly as the absolute value (which is what you're speaking of).
* I would say the relative value of haste doesn't change at all, but that would only be true in a toy model of dps, and with all the concerns over GCD capping, DoT-haste mechanics, and so on, I can't say that with certainty. But I'm very confident that the relative value of haste rating is rather insensitive to all these casting speed procs, and relative values are fundamental to choosing between stats.
In short, the whole way you've presented haste rating scaling with respect to casting speed multiplier procs makes it sound as if we get "free stats" or better scaling than we should otherwise expect. I'm not at all convinced this is the case. The multiplicative rules for haste rating interaction with casting speed procs are entirely typical and expected. Further, I believe the relative increase in DPS from haste rating is dominated by the first-order contribution, which is just haste rating % / (100% + haste rating %) and is insensitive to casting speed procs.
I do not think this "free scaling" is making any significant contribution to the relative value of haste rating. I do not think there is anything free about it.