Done basic 3 Proms as rdm & blm, which were ok at getting invites but both not on the "must have" list.
From my experience, many people raise new jobs just to get pt & pass prom. But b/c they rushed it, they in fact lack the skill for this job. I personally know that if I'm asked to take my whm(use for sub only) to prom I would probably perform hobbilbly b/c I dont have enough experience in main healing.
There's more than a few threads on the quest forum about prom too, that its good to have cookie cutter setup but not "must-have".
Long as people have proper equip, food, med, & even better Anima, things should work out w/o "best" pt setup.
There ARE 2 jobs I think are necessary through. One's whm(for raise) & rng(main or sub. need widescan to find the way).
Prom runs are all about sneaky IMO. Tried alliance a few times & never had good results. Small pt with smart ppl & someone(with widescan) leading the way does pretty much solves all before boss battle.
& as far as boss battle...long as ppl KNOW what to face & brought the right med, cake is the word.
Still remember the old days when cop first came out & prom causes nightmares. Think they are nerfed enough now that it really doesn't require that much to complete.