Dollar General wins out on low prices - essentially compressing their value prop onto a single dimension, prices. They won't do the Strong Towns things like sponsor a park or thoughtfully curate what they sell to fit community needs. There's no button to press in a DG that says "sell more eggplants please".
The value of a small scale community business is many things on different axes, of which delivering goods for money is one. Much like when you compress a jpeg for size at the expense of image quality, you can optimize for one thing to the total exclusion of others.
For a customer at the till it's totally reasonable to think on that one axis, but it's important that there be voices tasked with appreciating the whole. It's a need of society to think of what's a better lossless algorithm so that we can efficiently enjoy the benefits of all dimensions.