I see this line of thinking a lot and it just... like there's no real evidence that Kairi feels that way about fighting at all? She's one of the very few people who actively chose to wield the Keyblade. We see her excited about fighting Lea and asks for him not to hold back. https://twitter.com/steamwhistler2/status/1305823337361350656

We see her charge after Xemnas even after seeing him best three more experienced wielders. She takes down Xehanort. Like literally none of this suggests she hates fighting and only did it because she was worried she would be left behind.

Kairi is one of the least defined characters so far, but like her biggest defined trait is her bravery. She throws herself into battle constantly, not because she's scared of being left behind but because that's who she is. She protects Sora in KH1. She jumps off a balcony in 2.

She gets a Keyblade from Riku and fights Heartless alongside him and seems to enjoy it. It certainly doesn't deter her from fighting, and in fact her next big move in the narrative is to literally ask to become a wielder.

Like there is far more to suggest that Kairi actively enjoys fighting and being a wielder and being active in the story than there is anything to suggest she "doesn't enjoy it and it's not who she is". It is who she is. It's just someone she was kept from being able to be because

/other/ characters determined her ill-fit for it. We literally had Kairi wanting to go with Sora and help save Riku in KH1 and being told that she'd get in the way. She was shunted off to DI to wait for them. These are examples of the characters and story /keeping/ Kairi from

being who she hoped to be. And I certainly wouldn't see it as this great progressive move for the end of all of that to be "actually Sora was right, Kairi should have just stayed home and not get involved, she just gets in the way". Like, no?

This push I've seen around fandom for Kairi to "realize fighting isn't for her/not who she is/etc" and for her to just leave saving Sora for Riku to me just comes off as an incredibly transparent push for her to be written out of an active role of the series

just as she's finally on the cusp of being built up to have one. And I certainly can't agree with the idea that the best thing for Kairi's character is for her to realize she can't be anything more than a damselled princess like everyone wants her to be. No thanks.