I just started playing FFXI again actively since the days of Abyssea. Spent a great deal of time catching up and making my gear "good enough" for all the new content (while not really new anymore) Delve, Incursion, Skirmish, etc. I even leveled a job I never dreamed of getting into (Monk) just to get into these things.
Now, I've been playing FFXI on and off since 2004, and I realize the community has always favored certain jobs for certain situations. I find myself caught up on understanding things like Delve. The more I learn about the boss mechanisms, the more I begin to realize what SE was trying to do. For instance, boss monsters have varying degrees of weakness to certain weapon types at different times-- so bring a bit of variety so everyone feels included. When players see this, they think "bring monk and use Formless Strikes." Ok. That's fine.
Monk, monk, monk (or Samurai!), bard, white mage and sometimes corsair or red mage, sometimes scholar. This is the set up for Delve. This is the setup for most tier II BCs with the exception of Ark Angel fights and a few others where you replace monks with rangers. This is what everyone believes is the best possible setup for these events.
Everyone just automagically accepts that there is no better way. So I go along with it about 47 times for Delve. 45 of those times are in Foret de Hennetiel, the other two times against Tojil, over a period of about 3 months with many different people of all shapes and sizes-- all using the exact same tactics.
Some runs go more smoothly than others, but they all have one thing in common: Every single one of them failed. All of these runs ended with a wipe at the last boss. I still haven't won a single Delve run.
I can totally see the appeal of zerg rushing the boss and getting it done as fast as possible, especially considering the time limit. Usually, though, we will get to the last boss with more than 25 minutes to fight it with, and end up dead with still a lot of time left over. Remember that I am the new guy in all of this. Failure after failure after failure I ask these esteemed veterans of Adoulin: "Why not use a tank? Hate is all over the place and we monks can only handle so much before your run out of MP and can't keep us healed." "Oh." they will say. "It's so-and-so's fault. He is a newb healer. It's so-and-so's fault because stuns/sleep started getting resisted too early." It's always someone's fault. "He's so noob. She's so low gear." Over and over and over.
I will frequently record runs and rewatch them to pinpoint exactly where doing really well suddenly became struggling to survive. The only thing I can conclude after all this time is this setup simply does not work.
Sure, there are tight-nit groups and linkshells who use this setup and succeed all the time. This setup will work under EXTREMELY IDEAL CONDITIONS where everyone in your group knows exactly what to do and has the best possible gear for the occasion. When you see a /shout or a /yell in a major city for one of these runs who are picking up whoever feels like doing it at that moment, your odds of everything falling perfectly in place with the setup you want are astronomically low.
So after all of this people are still banging their heads against the wall trying to beat the same two Delve runs over and over. Boss slept your mages? "Oh they were just standing too close" Why not use poison potions just in case? Why not instead of everyone come as DD/Run have at least one person keep the boss's attention so he's not spamming sleepga on the mages to begin with? Why not TRY SOMETHING DIFFERENT FOR GOD'S SAKE. Anything at all! Has anyone tried low-manning these with pet jobs? Could there possibly be a way for one player to kite the boss and all the adds in a circle somehow so the rest of the party can pluck the boss from the crowd without such a sloppy start? Could we, I dunno, try using black mages? They seem awfully squishy against magic damage.
I just really had to get that out there. I realize nearly everyone will skim over this and have no idea what I'm saying. "Well why don't you make your own groups and try--" Stop. You know why. You know they won't waste the time to try something that might not work-- not when there is something that will almost certainly not work.