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The one thing in favor of haste-procs is that, since they proc off of spellcasts at a constant probability, they're more likely to proc (per time interval) when you're chain-casting, which is when you would most want them and when you would most be able to take advantage of them. The procs will tend to cluster more around their own ideal circumstances. However, the internal cooldown more than anything else is really what upsets that sort of statistical dependability. If you happen to get "lucky" too soon not only is the proc wasted then, it's also unavailable later.
And I'm going to chime in here that healing, compared to say dps, obeys threshold mechanics more than it obeys MOAR=GUD mechanics. You need more regen, until you can last the fight. You need more +healing, until your throughput matches the damage the raid is taking. There is of course room for letting personal skill stretch your abilities in favor of one or the other, but the stat weighting for healing is probably better defined by a piecewise function than a solid set of weights.
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