I like my ls, and I love SMN. I do not mind my role on our ADL runs on SMN for the most part.
However, I will admit to a strong, strong dislike for Avatar's Favor. If you are using Garuda's Favor in the mage party, or Ramuh's, it's because your -perp set sucks as far as I'm concerned. No, Squall is not affected by favor as far as I know.
However, the SMNs are usually set to farm bijous with a THF, and while the THF may tag with TH, it is a fact that 2+ SMNs are doing the damage. Damage does count if you want the mob to die in a reasonable amount of time. At which point I was informed I should just let the THF poke it to death while I keep up Carbuncle's Favor. My reply was to get a whm if you wanted a THF to do the actual farming >.>
That's all, just had to get that out.