Unlocking Content

[Kuroneko_Jutah]

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I don't really know what to say to this. You contradict yourself a lot. "I'm not lazy, but I don't want to have to do this thing."

I kind of wish there was a way to unlock things for all of your characters.
So say if I'm done with main quest on my main character, my 2 alts should have them unlocked too.

Because how do you, lore-wise, explain that all of my characters were the chosen one and they are all having the exact same conversation with everyone, they are all doing the same fights.
My main character killed ifrit, garuda and titan, why are they alive cause I made new characters? They all live in the same world

The lore states exactly why Ifrit, Garuda, and Titan, are still around and even explains the mechanic behind their returning every time you decide to run those fights again. That said, unless you're talking alts on other servers, the devs probably don't understand why anyone has an alt on the same server in the first place, seeing as how you can literally do everything in the game on one character.

As for "being the chosen one" there's a cutscene near the beginning of the game where you first meet Hydalyn, and in addition to your avatar floating around the crystal, there are other adventurers floating around it with you. You aren't "the chosen one", you are "one of a chosen many". To a certain point, if all of your characters started in a different city state, they technically aren't all talking to the same people until you leave for the first time.