Light of Dawn was adjusted because it was completely eclipsing Word of Glory.
LoD is our 31point talent. WoG is baseline that's accessible to every paladin. How did you come to a conclusion that using LoD over WoG was "problematic"? Isn't it common sense that a 31pt talent should be better than a baseline skill when those two skills share a common resource? Also, LoD was completely eclipsing WoG ONLY WHEN there were 2 or more targets being hit by the heal.
Sure, I agree that building up Holy Power (before the nerf) was rather easy and cheap by spamming HL on beacon'd targets. But frankly, I don't think you should've double dipped on nerfing LoD by nerfing BOTH our Holy Power generation rate AND the baseline healing of LoD. I would've been fine with either one of them, but both? come on.