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So I don't get it, if the unsent can remain on Spira (Yunalesca, Maechen, Mika, Seymour and Auron) Why can Yuna defeat Sin and then remain as an unsent with Tidus? Surely her love for him would be a significant attachment to this world.
I just don't understand.
... because she isn't dead, and she never died?
More to the point, the strong attachments and emotions that keep people in the world and out of the Farplane are generally not of the "feel good" type. Staying around as an Unsent generally corrupts people, both in their core and their mentality. Very early in the game, characters will point out that Fiends are Unsent after a long period of time. Some, particularly powerful Unsent, can become Fiends very quickly. E.g., half of the FFX-2 cast; plus, the Farplane is not free of Fiends.
If you're asking why the characters didn't think to just let Yuna die, it's because no one wants her to die. The consequences are non-trivial. The first half of the game plot revolves around people knowing that the end result is death. However, they are also assuming that successful Summoners and Guardians would go straight the the Farplane. This is only half true, and Yunalesca has made quite the effort to keep it this way with no alternative.
Also, they've mostly been lied to their whole lives. Yuna, Wakka, Lulu, and Kimahri have been hearing mostly lies enforced by their religious/political leaders. Examples of people straying from the path include Jyscal, who came back to tell everyone that Seymour was nuts; an example of someone who perpetrated this ignorance included Mika. Rikku knows slightly better, but is still a victim. Auron knows the truth but got himself killed, not that anyone would have believed him. Tidus has no idea what's going on.
>>> Because they will smell funny..:luca:
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Meta-story. They did not want her to die and it would be sad. Also you never know when you might get corrupted even though that eternal love thing should be enough to overcome everything as it is a fairytale and works this way.
If she defeats Sin the traditional way (where she and a chosen guardian would die) then Sin comes back and the cycle continues :v