By simply narrowing it down to "healers react to the damage you take" you are just going back to looking at dmg taken as opposed to the ideal of tank/healer stability, which is what we should be after. There are a myriad of factors to consider regarding healing reaction. Your burst size, previous bursts, raid wide damage, any number of mechanics, predicted damage, as well as their current mana can all affect how they react to that particular dmg intake. Each healer will react slightly different to each situation as well, so you'd have to include some incredibly large neuroscience functions into your healer simulator.
Haste also gains value if you can actually take advantage of the increased DS/min, which isn't always the case. You have to wait for burst damage to recover, so if the burst damage isn't coming too quickly (which is generally the case as if it is you should have a cooldown (or multiple cooldowns) active.) then you aren't gaining as much from the added haste unless you stop timing and just go for raw shield frequency, which just trades control for random mitigation, which isn't ideal.
It is only unpredictable if you are randomly placing death strikes as opposed to intelligently controlling your damage intake. This is also where cooldowns come in to play, as time you can't death strike is time you should be covered by some other form of damage control.
By relying on frequency over control, you are putting yourself at risk of being more unpredictable than with less ds/min but better placed mitigation through mastery.



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