This is not reflective of the Costco shoppers I know and the place Costco fits in their lives.
Bi-Rite and Erewhon or Citarella and Eataly are not Costco competitors.
To understand the appeal of Costco to suburban families, you have to understand their caloric needs. Costco is the best solution if you need to buy 48 eggs and 4 gallons of milk a week along with 8lbs of chicken, 4lbs of turkey, and pounds of broccoli, green beans, spinach, sweet potatoes, onions accompanied with apples, peaches, mangos, avocados, blueberries, strawberries and oranges.
I don’t need “a varied sense of taste” to budget and do simple math to determine the membership is worth it.
Babies don’t need “a varied sense of taste” to use diapers purchased from Costco in bulk at a great price.
Do I lack a “varied sense of taste” when I buy ingredients from Costco, like chicken thighs and rice and eggs and olive oil, and cook them at home?
Honestly I wouldn't say Costco is terribly convenient, other than the limited selection.
Everything else I'd rather get from my local grocery stores.
the lack of choices for similar products is a huge plus for me - speeds up the shopping process considerably, and their curation is pretty good