You know what this song was? A culmination of Garnet's personality. She was a complete character, none of the others got that sort of song finale.
Pearl's still heartbroken and can't live just for her, Amethyst is sort of shuffled off to the side with Famethyst, Peridot doesn't get the 'I'm ME' song, neither does Lapis. And Jasper's a kino redemption arc that should have happene, learning about fusion between who she was and this corrupted half of her self from Garnet as the once-adversary made tutor, (her hangups have always been about fusion and personal strength, not being able to rely on or interact with others for fear of weakness in herself), so when Garnet gets some evil version of herself, Eyeball gets Sapphire in that weak state of learning the truth of Pink Diamond and there's this twisted Garnet running around,
so Jasper has this song about the lessons she's learned. https://voca.ro/5nENnUfD6ad Apologies for man vocals for a girl.
Only Steven really got that sort of culmination musical bit.https://www.youtube.com/watch?v=IuawMKJIo38
Sugar needed to give all the characters musical closure.