I agree. I hated walking in the city I lived in Canada before moving to Tokyo. It wasnt very walkable and you really needed to plan for any type of long walk as you might end up in a place with no food or drink shops anywhere. The way Tokyo is zoned allows for every possible convenience I need within a mile of everywhere I walked. I felt extremely safe at all times too which made things way less stressful and allowed me to be completely in the moment.
Agreed about mixed zoning, I should've mentioned that too. It does not necessarily go hand in hand with walkability, you also want to be able to buy eg. water especially if it's hot. But I guess it usually comes together with density
