Because it is.
Most casual PvE content is over so quickly that major discrepancies between classes either aren't apparent or dont have the chance to create a meaningful impact. It's not a knock against the content its just the reality of design. There are jobs that dont even fully utilize their entire kits in things like Ex dungeons etc because it either isn't worth it or things are dead before they get the opportunity.
The things that are actual issues are likely to be caught first in harder content where it makes much more impact before it will trickle down into casual content, but not the other way around.
Maybe? It's possible, but extremely unlikely. I'm going to need a citation on that "good portion of people" if you can.
In a game where you are able to play every single job on the same character, the speed at which you kill level 65 rabbits solo on the hills outside of Kugane is hardly relevant to overall class balance as a whole.
I understand your point about dungeon clear times however this is already a reality depending on party skill / job composition.
Do you currently feel this way about Black Mages? How about Bards? or Machinists? Does it enrage you to watch the speed at which people kill mobs outside of cities? Does it matter in the long run?
Still going to need that "most people" citation.
Do you take personal issue with a BLM doing more AoE damage in a trash pull than a NIN or a MNK?
There will be an outcry either way, the player-base isn't a unified hive-mind of one collective opinion. whether the outcry is warranted / based on actual design issues will be the question.
And as stated before: Current listed potencies on abilities are subject to change.
