This anti 15 min cities thing is bonkers. I've lived in 15 min cities and London. 15 minute ones are a much more pleasent experience.

As to Oxford, my nephew was a toddler there 20 years ago and one day he was lining up all his toy cars. For a race was my guess. Nope, he was playing "car parks and traffic jams". No one has been able to drive easily in Oxford since about 1975. Because we spent 900 years building a walking city before the car was even invented.