Small grocery stores in Europe are miserable to use. They're always missing some of the stuff I want. Customers will usually choose the big box stores when they have a reasonable way to get there, regardless of urban planning.
Here’s a video about why small grocery stores are better called “Why Grocery Shopping is Better in Amsterdam”:
https://youtu.be/kYHTzqHIngk
This is why I asked you for a source. We can play anecdote versus anecdote all day. In the absence of a source I’d be very curious what you think of any specific points made in the video.