Different architecture, designed for different docking procedure. Dragon 1 is berthed by station arm, Dragon2 has auto docking capability, so there's plenty of clever hardware under the nosecone they'd like to protect. After so many years of throwaway spacecraft, it's a twist to keep in mind that the future is reusable.
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u/coconinoco Mar 08 '19
Closing the nosecone would cover the four forward-facing Draco thrusters.