Gameplay And Story Segregation
You're missing the point so hard it's making my brain hurt. >_<
You can't just say that the story has already happened and therefor you can be a NIN if you want. From the view of a new character, the story
has not happened yet. Unless you want new characters to be completely unable to view the storyline up to this point, which would be silly. Remember, if the story has already happened even for new players
then the Waking Sands has already been destroyed, someone's already defeated Lahabrea, Thancred has already recovered from his possession, Cid already has his memories and airship back. . .Basically the entire main scenario isn't a quest they would do.
Remember, even though these are all things that have already happened for established characters, for new characters they have not. It makes no sense for a new character going through the story to have interactions with these characters based on where they are now as opposed to where they are according to that character's story.
And if they aren't going to do those quests, then why would they get the rewards for them? Alternately, if you're saying they've
already done those quests, then they should have the rewards for them. Are you going to give new level 1 characters all the rewards for doing all the main scenario quests up to this point? Or are you going to make them do the quests to get the rewards? If you're not going to give the rewards at all, we won't get any new players/characters. If you give them to level 1 characters, I know how to tank the Savage Might IV market. If you make them work for the rewards, well, we're back to having to do Through the Maelstrom to get NIN training, because that's the only way for Yugiri herself to train the character.
And before you bring up NIN in pre-2.2 dungeons, just give it up. The game already separates dungeon composition from lore, otherwise you could never have 2 WHM in one instance. No one's arguing that NIN should not be allowed in pre-2.2 dungeons except for your strawman. All anyone's saying (that I've seen) is that you should have to complete 2.2 in order to be trained by the NPC introduced in 2.2, or else face a plot hole (or massive, wasteful retconning).