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Non-theropod dinosaurs and feathery/fluffy integument

Why is it conventional for paleoartists to cover their smaller theropods (or infants of larger theropod genera) with feathers or proto-feathers, but not dinosaurs from other clades? I have almost never seen, say, a "coated" ornithopod, psittacosaurid, or stegosaurid hatchling. As much as I miss the featherless, scaly dinosaurs of my childhood's 90s dinosaur books (in my opinion they look much sleeker, shinier, and more lithe than the dinobirds of contemporary reconstructions), I believe all of the smaller dinosaurs (as well as the young of the larger kinds) probably had integumentary covering, for purposes of insulation. All smaller endotherms need insulation.

BTW, is it possible that some dinosaurs may have had "nappy" or kinky integument (thinking Afro-type), as opposed to the straight fluff/feathers usually found on fossils bearing impressions?

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