John Curran wrote:
If by "design choices" you mean the tradeoffs accepted in selecting a particular candidate protocol and declaring victory, then I’d strongly disagree.
What actually happened is that SIP was chosen but modified by IPng directorates to pretend, for political purposes, IPng were a merger of all the proposals only to make the result totally unusable, during which address length was extended from 8B to 16B to accommodate so infamous XNS style auto configuration. Masataka Ohta