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

[SeiyaSoiya]

I guess the Devs could remove PF and revert back to 2.X. Shout in the zone till you found a party?
Would there still be a shortage of healers? Would certain jobs get excluded? Would the Devs still make a decision to balance without PF?

everyone always assumed the people spamming shout chat even back in wow were the bottom of the barrel scrubs who will never clear
true well adjusted social individuals always had an active guild with set raiding schedules and all roles filled, they never had to resort to pugging
pugging has always been seen as the last resort