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The size of grocery stores in the US, coming from Hong Kong. Also, the massive lack of good public transit, urban walkability, and just cars cars cars everywhere.
The things you point our are lacking are the reason the grocery stores are so big. When you go to the store it's not just a small thing you do on your way to do something else, because when you're in a car nothing is easy. Parking and walking into the store can take a few minutes, so stopping after work every day gets annoying fast because what could have been a 5 minute stop on fklt inevitably turns into a 15-20 minute stop.
So, you make going to the store a once or twice a week thing, and you buy EVERYTHING you think you'll want or need in that week when you go to handle that the store needs more in stock.