I’m glad I’m not the only one who finds it silly it came up as a reason not to move somewhere, I’ve always just gone to the grocery store closest to my house, whether that’s Albertsons or Smiths or Vonns never really mattered.
Well, you should pay more attention. It's the most money people spend week to week typically in a household.. and you can find prices can vary 30+% quite easily on the same goods.
The very attitude you describe is exactly why grocers will put stores even in the same brand almost on top of each other and carpet bomb an area. They pray on the convenience angle, strangle out competitors and pump up the prices.
Then when people are talking better brands... the experience is not just your dry groceries, but commonly things like Hot Food, fresh prep'd meals, specialty foods, bakeries, seafood, etc.
If you are the type that is used to eating fresh meals most days, getting simplified prepped meals, eating nice affordable lunches, getting the specialty brands you like, etc... That is very much a 'regular' part of your routine that when you lose it, it's a big hit to your lifestyle. And thus, a factor (not THE factor, but one..) in the kind of area you want to live in.
Some people will buy 2-3 weeks of groceries at once and eat out... others will buy groceries for just 1-3 days at a time and eat a lot more fresh meals. It's as much a lifestyle choice as people choosing to live in a urban style of living vs suburban, etc.