What do you think about the low number of grocery stores in the U.S?

I live in a US suburban town and have at least 4 different grocery stores within 5 minutes of my home. Not that it matters in my case, though. I use Instacart, a grocery delivery service.

I'm lazy so I mostly use Trader Joes, its small, on my way home, and most of it is ready to eat.

We have plenty of grocery stores where I am.

What I'm not happy about is the price fixing going on between the stores.

I'm an exception, as I have three grocery stores within walking distance of where I live: Whole Foods, Trader Joe's, and Vons/Safeway. They are all less than half a mile from me. However, this is not typical in the USA, where most things are car-centric.

I loved living in Europe, where grocery stores were smaller, had a more neighborhood feel, and everything was truly within walking distance. The food was also generally better. Regardless, I think there are more than enough grocery stores here in the US/North America.

What do you consider a low number?

There are at least eight grocery stores in my town alone. That's pretty typical. I live in the suburbs, not a big city.

My sister who lives down in rural North Carolina has four in her town.

All kind of stores are permanently trying to expand, that's the core nature of capitalism.
For groceries there's the problem that consumers do not buy more stuff, meaning for every growing store there must be another one shrinking or a small one disappearing.
Since larger stores can offer lower prices there's a trend for ever larger stores which for groceries also means ever fewer stores.

However, bigger stores that eliminate smaller ones depend on customers being able to drive the longer distance, which for one requires a car and for two the amount of stuff people want to buy must give so much lower prices in the larger store that the time and money the longer drive costs is worth it.
In a country like the US, where over 50% of all people cannot even pay their rent on time, there aren't many options for groceries to grow and move further apart, simply because so many people can't reach the bigger ones.

Personally I don't really care because I'm fine either way.
I own a car and am retired, meaning I have the time and the option to reach the larger stores, but I live in the center of a medium sized city and I also have the money to pay the higher prices in smaller stores.
My wife and me drive once a week to a large grocery store outside the center and get a weekly supply, but anything that spoils quickly like fresh meat and vegetables we're getting on a daily basis from the small store around the corner, less than 2 minutes on foot away from our home.

Where I live in St.Louis MO, on the Southside where I live, they have 4 grocery stores: Dierberg's, Schnuck's, WALMART, and ALDI and ALL are always busy, especially on Saturdays

Plenty around me which allows comparison shopping and saving money. Plenty of huge supermarkets too.