I feel that there must be some physiological stressors or environmental factors that inhibit modern organisms of all domains from reaching the size, of say, a megaladon or brontosaurus.
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The bird-like features most likely allow dinosaurs to get as big as they were.
They laid eggs instead of giving birth, which allow them to give birth more quickly and their offsprings were able to feed on their own very quickly, allowing the mothers to feed and produce more children etc.
They respiratory system allowed them to get big. Mammals cant get this big, because their weight would actually crush them. Whales need buoyancy of the water, but the bird-like air sacks allowed them to grew larger and larger. That probably also had evolutionary advantages, becuase the type of food available for them (some theories how most dinosaurs had to eat foliage from plants and trees, meaning the larger they got the higher positioned foliage they could eat which allowed them to get bigger which required more food which allowed them….) being bigger was better.
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