There is a significant population of Holy Pally’s (and really skilled and well progressed ones at that) that believe Red Int gems are better than anything else, even if it means less overall stats. I have “math” that shows that to be incorrect. The counter to it is “real raid experience” which says Intellect provides consistency. By this they mean larger up front heals. No need for haste/mastery modifiers. Thok was used as a way to say if you have more intellect you will have more smart heal and more shields or in the case of EF, larger EF ticks. So. Lets do math!
What I have shown here is how much more healing a LoD would do with 1 intellect gem or 1 mastery gem. I also have shown how much healing 1 tick of EF will do (on 3 targets) with 1 intellect gem or 1 haste gem.
You can clearly see an output gain for 320 mastery > 160 intellect. Counter argument is what if the shields aren’t used? That is fair but over-heal on Thok is going to be low and when you compare over-heal on the direct heals vs. Illuminated Healing it isn’t close (20-70% compared to 3-15%).
EF is harder to make a case against conceptually even though the output numbers are so different. Let me try. A 320 Haste gem is about 0.9% more haste (buffed). That is about 1% more healing in the same period of time, sort of. Over the course of say 90 seconds we would get 43 EF ticks on 1 target, 129 on 3. .09% more of that is 1.1 more EF ticks. Those 1.1 ticks do far more healing than the small gain you get from the larger tick size with a Int gem (EF has poor SP scaling). 33k compared to 14k!
So, where is this consistency you speak of?