Why doesn't anyone support any of their "facts" with evidence?
Here is a little math where I compared (on ptr 3.1) the effectiveness of a common holy build (51/0/20) to an uncommon proly build (28/43/0) Please keep in mind that this does not pertain to the OP as they are suggesting 51/20/0, which I will disagree with as being an "FoL" build and will never reach a 10k+ FoL unless you use wings.
Holy HL (42.41% crit, 2300ish spellpower)
11000 * (1-.4241) = 6335
16000 * (.4241) = 6786
13121 average
mana
1274 * (1-.4241) = 734
510 * (.4241) = 216
950 average
13121 * 1/1.48
8866 HPS
940 * 1/1.48
635 MPS
13 HPS/MPS
________
Proly FoL 37% crit 2600ish spellpower
4700 * (1-.3741) = 2942
9300 * (.3741) = 3479
6421 average
mana
307 * (1-.3741) = 192
123 * (.3741) = 46
238 average
6421 * 1/1.28
5016 HPS
238 * 1/1.28
186 MPS
27 HPS/MPS
About 3.8k HPS more from holy HL spam or about 33% more HPS though you should note that hps/mps for proly fol is more than twice, basically twice as efficient per the same amount of hps.
Now... here's where things get interesting. Statistics are purely basic in these examples. If i was to compare a statistic where FoL was being used with HL every other cast or as a reactive cast I could see that the playing field would level out on both hps of the proly build and the hps/mps of the holy build.
Really we are all splitting hairs here.... And yes I do keep my tanks capped with FoL and through recount I may not do the most total healing, but I do do the most healing on my tank with FoL spam + HL sprinkles.
HPS definately does not define an ability especially when compared to a statistically difficult situation. Also the above does not include extra crits from SS which may account for more.
Actually I should point out that having additional SS absorption helps bridge the gap between the two for healing and only increases efficiency of the FoL.
No one will probably read the above, but if you have any questions please ask me.
http://www.mmo-champion.com/index.php?topic=46988.15
contains the original analysis of proly vs. holy which is basically a FoL versus HL discussion.