FFXI went through many different "Best" party setups over time. There was a time where Arrow burns were very popular in Sky IIRC. Grab someone to voke (maybe, not always) and have the RNG stand with some distance between them. They all just fire arrows until the mob falls. Rinse and repeat.
Anyone remember Fist Burns in KRT? Normally consisted of parties full of MNKs, though a few PLD did well there with high staff skills and Full Swing (I think that was the WS). Hell, remember when PLDs wanted staff skill so they could tank with the Earth Staff?
There was a time where NIN and /NIN were the only way to go as 1-Handers had a big advantage over 2-handed DDs.
Then after the SAM update with Hasso and Seigan in ToAU days DRGs and SAMs became big DDs especially in merit parties on birds.
Ah memory lane... such a fond walk.