I just don’t get the argument that they need to compete with those other stores. I have a Safeway (Albertsons) and Fry’s (Kroger) less than a mile from my house

I just don’t get the argument that they need to compete with those other stores. I have a Safeway (Albertsons) and Fry’s (Kroger) less than a mile from my house. I go to these for my general grocery shopping along with a few smaller specialty grocery stores. I have a Walmart just over a mile from my house and sure I’ll buy groceries there but usually because I am already needing a hardlines product from Walmart. Costco is by far the biggest clusterfuck of them all and I’ll only step foot in there if I’m buying bulk items or want something that only Costco sells. Why can’t they all have their niche?