MIPs are pregenerated smaller sized versions of the original image to help speed up rendering when the texture is shrunk onscreen, like when you're far from a door one of the smaller MIPs is used for its texture. The trade-off is better frame rate with more RAM used to load the textures.
Unless you're shrinking the UI elements to less than 3/4 size, yah don't need MIPs for those images. The first MIP image doesn't kick in tell around 66%.
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