Those shouts exists because most of those people lack insight and they're nothing but copy cats, they read somewhere such and such strategies works and they think just because of the same exact jobs will make an automatic win. Imagine if in a party with an OChain PLD but no DD with skills cap. They could still potentially run into time out issues because they cannot perform enough damage. Likewise, what if those 5 MNKs are all abyssea leveled and never went to skill their skill. Or come to the fight without acc food or i.wing, etc. etc.

If you dont have friends/ls where you can get help with, then formulate a strategy based on what jobs you can get (you can shout for it) and go farm up some tails.