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One of the issues we urban planners faced in trying to create pedestrian friendly places is that the traffic engineers were dealing with a Big O problem. Connected street systems that enable walkability couldn't be modeled in their systems in polynomial time.
Do you mean that their modeling was bad or that the problem is intractable?
The modeling was simplistic based on “service levels” and has not been updated in decades. This problem is solved millions of times ever second by the likes of Deliveroo and Uber. It has not found its way into the hand of AASHTO, yet.
There were too many variables in a grid based street layout for the tools they had at the time. They couldn’t model traffic flows back then. It’s akin to if scientists denied bees could fly because they couldn’t prove it. Yet grid based layouts the world over prove otherwise.
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