Trigonometrize.
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The only problem with this argument is that Alderaan is relevant to LEIA. How she handles the loss of her world is extremely important to her character. We know Obi-Wan, yes, but we also know Leia.
Empire could've tried to rectify this and have her deal with the loss of her planet, but instead she was made into a love interest and given nothing to do.
Oh, Star Wars...
The destruction of Alderan was about establishing the Empire's character and not giving Leia something to deal with. It works much better at giving her even more motivation to leading the Rebellion to destroy the death star and then eventually the Empire altogether than as a genuine character moment given that Star Wars is about the characters we, the aduience know and care about, interacting anyway IMO. Leia and Alderan do not fall into that.
If Leia was a male character they would've handled this just the same. No one will connect with Leia grieving over Alderan like Luke grieving over Obi-wan, regardless of gender.