There was some nice discussion about how the meteors were placed in O5S in the other thread. Here's another one...
Why are PF groups enforcing 2 MDPS in O7S?
I can completely understand why you would not want 3 MDPS, since one of them has to lose up-time during chakra burst.
What I do not understand is why groups will not allow 3 RDPS when one of the RDPS can simply stand in one of the MDPS positions and do exactly the same DPS as if he was stood in a ranged position. You need 1 MDPS if you plan on using the single-target LB in your strategy. You don't need any if you plan on using the AoE lb, unless you really want that DRG or NIN for the utility. Correct me if I'm wrong but doesn't the mage LB on two targets does more damage than melee lb on a single target?
No it does not require more running around. The MDPS chakra spots are actually closer to the middle where you are likely to be for most of the mechanics. You are also already pre-positioned for virus in the MDPS position and don't have to run to a corner. There is no difference in running with the other group on bibliotaph load.
I feel like people are just following the "norm" without actually stopping to think about what they are doing with their group. I have yet to meet someone who can give me a seriously valid reason for why you need at least 2 MDPS for this fight. If that is the case, then I hope the word spreads so people stop demanding 2 MDPS.
