10 minute walk away from a supermarket only gets you so far when you spend an hour in one direction commuting since you probably go to work more often than you go grocery shopping.
I spent 3 hours grocery shopping today. I spend 3 hours total commuting to work every weekday.
I'd still be ecstatic if I can get food within a 30 minute walk. I went so far as to try to run a startup around this. It's possibly why there's so many food delivery startups; this is a big hit to quality of life.