I presume you don't do family shopping (easily 30kg), or +-gazillion of other use cases that your 'solutions' don't cover and would make people's lives measurably worse and more stressful. If I have to carry all my load for weekend adventures to car that is parked 300-500m away I end up properly sweaty even in coldest winter day, and sometimes its just not possible. And I work out hard on average 6-7 times per week.
I love walking, sometimes spend hours on long walks since I live in a very pretty place but forcing everybody to adhere to your own vision of car-less cities without offering a proper alternative (not those you mention in this thread, they are far from enough)... sucks.
How can anyone transport 30kg without a 1500+kg vehicle that destroys our environment? A small folding shopping cart, perhaps? A bicycle with baskets? Your alternative is worse than those you dismiss.
You make this claim like those are the only two options. There is a wide gulf between driving an "environment destroying" vehicle and pushing a cart 10 miles in 100F degree weather.
I love walking, sometimes spend hours on long walks since I live in a very pretty place but forcing everybody to adhere to your own vision of car-less cities without offering a proper alternative (not those you mention in this thread, they are far from enough)... sucks.