As a new zealander walking to a grocery store sounds weird. I've lived in 7 houses some rural some urban and in none of them could I walk to a grocery store, so it's very weird to hear it exalted as some "standard" that America always fails in.
It's interesting to ponder if it's just the low density (caused by "having too much land" to expand on) or other factors that deprioritise walking like this.