Another advantage to a high haste build is Expel Harm spam. H Lei Shi 25m later in the fight at high stacks I'll pool energy and spam EH just waiting for my health to dip < 35% for a moment and reset the CD. So you can spam it 2-3+ times in a row and know it's saved me more than once (especially when it's crit'ing).
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The four elements, like man alone, are weak. But together they form the strong fifth element: Boron.