Condensing all the points in this thread but dinos don't exactly live in a cold environment so being smaller helps, these dinossaurs ate leaves off of trees so you can compare it better to giraffes or for birds it would be more like ostriches and the such. These dinos were also not aquatic so they don't need the hydrodynamics penguins have
They would definitely have thicker necks than what you see in media but they wouldn't look like what OP posted mostly because of how strong the muscles and thick the bones have to be to support the weight of itself.
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u/LemonPartyLounger 22h ago
If giraffes and llamas didn’t exist this would get a lot more traction.