OP Updated with DP tweak and the base/coefficient changes on multiple attacks. Added note about Synapse Springs.
Originally Posted by Holylegolas
Does this still hold true with haste also reducing the GCD as stated in the tooltip for Sanctity of Battle?
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10% of 1.5 seconds (GCD) is ~0.14*. 10% of 4.5 seconds (CS CD) is ~0.41 seconds. 10% of 6 seconds (Judge or HoW CD) is ~0.55 seconds. As you can see, Haste will increase the frequency of access to abilities 3 to 4 times faster than granting more time to use them.
Thus the gains from Haste would diminish earlier than some hard cap, while Crit only increases in value as you gain other stats. The more Haste you have, the more attacks (auto and ability) you are making, which means more chances to Crit. Thus one more point of Crit is more valuable than previously. We are nearly guaranteed a 10% Baseline Haste due to raid buffs.
* Haste isn't (Length * (100% - Haste %)), it's (Length / (100% + Haste %), so the number isn't as clean as you'd think at first glance. 10% Haste on GCD is actually 1.5/110% ~= 1.3636, or about 0.14 gain.
Divine Purpose
If we do have little GCD wiggle-room, the second disadvantage of DP (first being not on-demand) shows up: Where to fit the blasted things. With everything and its brother generating HP it seems to fit way down on the priority. Even at bottom of the pile, the only time I see an issue is when you proc off a 3HP TV (rather than a 5) and things all drop off CD. If you use TV/Inq at 5 HP, then 'worst case' you can use 3 HP generators and your talent (ES/HolPris/LH) which pushes you back to 5 HP and the need to dump. That's 4 GCD, or sub-6 seconds of an 8 sec Buff. You still have 2+ seconds to use the DP before it expires. Only if you were at 0 HP and could generate up to 5 would it be an issue.
So I'd express it in this fashion:
If Inq_Timer < 2, refresh (which would use your DP if present)
If DP_Timer < 2, TV
Everything else (this line is alphabetical, not a proposed priority: 5-HP TV (eats the DP first), CS, ES, Exo, HoW, J)
If DP or HP >=3, TV
I think that would get you the tightest/best performance.