Your argument in favour of Gimp is that its default UI is dreadful? (I agree, but it's the fault of the Gimp UI, not of dark modes in general.)
replyI don't like its default look, but the screenshot they linked was non-default and what I do like, so I'm wondering why they find it sloppy/bad. Perhaps they would like Gimp's default more? Here's a representative shot from 2020: https://www.lifewire.com/thmb/H9QCFUVFrU035srbCoZ5erwS20Q=/1... Not even the +/- buttons another comment complains about are in this one.
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