At the limit, if you remove all capacity (or leave a nominal capacity for a single commuter that works beside their home to remove infinites), the individual transit time goes to zero! It follows we should remove all roads!!!
It seems to me that the average transit time is the wrong metric to optimize for.
No. In Braess' paradox both the situation with and without the extra road have the exact same total flow from A to B. Removing flow capacity is not allowed.
It seems to me that the average transit time is the wrong metric to optimize for.