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saying the 4 piece is built toward FoL is stretch,
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Is it?
Holy Shock is an HPS loss for a HL-spammer. It shouldn't be used.
Holy Shock interwoven with FL spamming is an HPS increase. HS is not mana efficient, but FL-spamming is and can afford to sustain Shocks as needed to keep the stacking SP buff up, for what it's worth. An extra 255 spell-power is more of an advantage to small heals than large after factoring in over-healing.
the intrinsic failure of FL is that inevitably a point is reached where it's not cutting it and you have to switch to HL. This is made highly impractical due to Light's grace not being maintained and the initial HL cast being too long. This is partially answered by the 4 set bonus; reducing that initial HL by 0.3 seconds. Also consider that some of your HL's would have very short cast times as you wove HS into the HL spam to keep up the libram buff.
The advantages are obvious: better mana efficiency without using divine plea, lower over-healing, as well as better mobile burst-healing capabilities (HS glyph, SP gemmed, etc.)
I think this is the design blizzard is aiming for: to make short phases of HL spam possible but have FL our primary heal assuming we can properly use the HS "buffs" available. Is it going to be competitive with straight HL-spamming? Probably not. However, if IC bosses hit light and fast and my slightly slower HL is being sniped by hot ticks and fast heals... maybe.
The real appealing aspect of the design is that it would require a lot of finesse to pull off: to know how much HS to use, when to switch back and forth between HL and FL spam, and to do so without using Divine Plea. Sometimes HL spam can have a very 'brute force" feeling to it.
Please don't construe this as an argument for FL. I'm gemming int, gearing haste and relying on HL in IC like everyone else. I just find it interesting to see hints at Blizzard's design philosophy for us. I'm pretty sure they don't like us relying so heavily on one stat and one spell. I think one yellow socket and no int bonuses on our tier reinforce this idea, and so does the complete lack of plate haste/MP5 gear.