Why does everyone use PF as a representation of the game?

[Ransu]

I have been told for the last 6 weeks by seemingly people who cleared that there can never ever ever be balance issues if a single team of players managed to clear the fight on week 1 using nay particular job no matter how undertuned it is.

Aside from the fact that fflogs basically showed none of those jobs clearing week 1, using week 1 top tier players as an example of balance is never a good thing because the best of the best can get around extreme issues, but even then this tier the best of the best were forced to swap off jobs like WAR, PLD and MCH to reach a week 1 clear.