The 2nd and 3rd versions of Boruto's "Sayonara Moon Town" ending title depicts some beautiful SasuSaku symbolism, such as the two threads of pink (representing Sakura, since pink is one of her representative colors) and purple (representing Sasuke, since purple is one of his representative colors) coming together from completely different directions, but once their paths intersect, over time they meet and then separate again but each time they become increasingly closer and more tightly interwoven with each other. Sasuke and Sakura's lives started separate but came together and became tightly intertwined into one. The threads representing their bond creates a symbolic DNA strand leading to the birth of the new Uchiha, Sarada, represented by the Uchiha clan crest that emerges, a symbol of the new life born of Sasuke and Sakura's love.
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There's also nice contrast between the Shippuden Ending Title "Black Night Town" and Boruto's "Sayonara Moon Town", showing how Sasuke's life progressed from the lonely, dark life he had a kid/teenager to being surrounded by a warm and loving family in Boruto:
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There's other neat symbolism in the "Saynora Moon Town" ending title, but what I wanted to call attention to is the lyrics of the song, which describe Sasuke and Sakura's feelings for each other and the nature of their relationship remarkably well. It's basically a love duet, with Sasuke represented by the male singer and Sakura represented by the female singer.
In particular, the line from the song I wanted to mention is: "Tsuki ga kire, desu ne?"
What the phrase means is "the moon is beautiful, isn't it?", a phrase that can also mean, "I love you".
Japanese people are known for being more reserved with expressing their feelings, and the Japanese language is known to have a poetic and lyrical nature. Saying "the moon is beautiful, isn't it?" is a subtle and indirect way for Japanese people to say, "I love you". The idea behind the phrase is that two hearts possess a deep understanding of each other don't need a direct confession to understand the other's meaning. It's a Japanese phrase that perfectly captures the essence of SasuSaku's relationship and the nature of their feelings for each other.
It's interesting that the lyric writers chose to use the phrase, "the moon is beautiful, isn't it?" for Sasuke's character in their song. I'm drifting completely into headcanon here, but I like to imagine this would be a phrase Sasuke once said around Sakura to confess his love (at least, this Boruto anime ending title song put that idea into my head). We all know Sasuke's past, and the moon was tied to negative landmarks in his life: the massacre of his clan, his desertion from the Leaf, the brutal war, his fate as Indra's reincarnation, etc. Sasuke even said that the full moon triggers flashbacks of the Uchiha massacre and the sight of it always dredges up memories of that terrible night (i.e. the moon is a terrible reminder to him).
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Yet by Sasuke's representative singer describing the moon as beautiful in the SasuSaku love song, it poetically represents the healing effect Sakura has on his heart. What was once an ugly reminder of a tragic, traumatic past is now a natural element of nature's magnificent beauty that can be shared with the person he loves. It's a symbolic way of showing how far Sasuke progressed as a character, how much he has healed from the pain of his past, and how Sakura and Naruto helped him to move on from his painful past and look forward to the hopeful present.
