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Solgaleo wanted it, but Lunala hated it. That's probably why Dusk Wings is so shit compared to Dusk Mane, it's a harmonious fusion between the two, while Dusk Wings is nonsensical amalgamation (which explains its awkward back piece and the unnatural way it holds its arms). In other words: Dusk Mane is a yes, Dusk Wings is a no.
Oh shit this is my new headcanon.