How do you transport the groceries? I feel like this is my only problem, 90% of the reason why I need a car. I would be unwilling to use some kind of cargo bike in the winter.
Just carry them, or use a small cart. When the grocery store is small and it's a convenient walk across the neighborhood it's actually a pleasant experience that you can do several times a week.
here at least that just leads to ditches and bike paths strewn with shopping carts.
Travel by car has covered the land with pavement, polluted the air, and filled our public spaces with endless noise.