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The point of Ladybug being immune to Sublimation’s power isn’t that she is the best person she can be period; it’s that she is the best person she can be right now, with the cards she’s been dealt. And these cards are, admittedly, pretty terrible.
She’s still flawed as a girlfriend, as a superheroine, as a guardian, as a human being! She still makes mistakes and still needs to face consequences! That was the entire point of the Miraculous Cure fixing the damage she caused. Like any teenager, any person really, she still has room to learn and grow!
But, crucially, the people who love her (in this case, Chat Noir, but we also see it from Alya and Sublime) are willing to meet her where she is: their affection and support are not conditional on the progress she hasn’t yet gotten a chance to make. And Marinette loves them as they are in turn — I think we’ll all agree Chat Noir’s mental health definitely isn’t optimal, yet he was able to break free from the spell too, simply because she believed he could!
I think there’s a lesson to be learnt here. The power of love always so strong, and all that.