Until they add that gearscore check for things like Titan HM, I will agree with that. I personally feel like 3 healers is way overkill for Titan HM in most cases (with a good group, of course). For people who don't know what they are doing, no amount of healers will save them. xD
In my FC we still do 3 healers most of the times, the reason is because we are already going for our fifth relic as a FC and most of us are on jobs either under-geared or pretty much not knowing how to play the jobs properly, so we play it safe, and try not to suck too much during the heart phase lol
We did have one run, still with 3 healers, and 7 of us with relics +1 with the exception of 1 BRD I believe which we were doing the run for his relic, since he had to do WHM in the previous run, we smashed that Titan and certainly the 3 healers felt over-kill in that situation.