Balancing out the other comment - there's two real supermarkets within a fifteen minute walk of me (another American). It's fun to leave meal planning up to whatever is on sale that night.
For people in the outer suburbs where that's not an option, I don't know why a service hasn't arisen where you can plug in, "we have X adults living here, they average Y meals per week made at home, we want Z grams of protein per meal, here's our dietary restrictions, solve that system of equations out of whatever's in your warehouse and take a flat rate for delivery and percentage for your overhead." The pure delivery services all seem to be plays to hide huge prices behind tricky introductory rates. Both my local supermarkets offer delivery and presumably have the data to make that possible but they want me to still pick individual items in a vastly worse interface (any website or app) than the experience of standing in a dry goods aisle.
You underestimate how hard people’s food preferences are. They are really locked into their set of brands for each item. Immigrants pay huge markups to just get the same brand of tomato paste or beans they know. These are some of the most commodity style food items
For people in the outer suburbs where that's not an option, I don't know why a service hasn't arisen where you can plug in, "we have X adults living here, they average Y meals per week made at home, we want Z grams of protein per meal, here's our dietary restrictions, solve that system of equations out of whatever's in your warehouse and take a flat rate for delivery and percentage for your overhead." The pure delivery services all seem to be plays to hide huge prices behind tricky introductory rates. Both my local supermarkets offer delivery and presumably have the data to make that possible but they want me to still pick individual items in a vastly worse interface (any website or app) than the experience of standing in a dry goods aisle.