My main concern for homemade vs. store bought would be health. Homemade mayo is not something I would consider due to the raw egg problem.
Then I decided to make my own homemade tomato soup. After straining out the peel and seeds, I could discern no difference in taste between Campbell and homemade. But a big difference in cost. Considering how many tomatoes along with milk, labor and electricity it took, to get the same amount as a properly made can of soup, I'll stay with Campbell. But should I make my own crackers to crunch in the can of soup? I do have a recipe and they are very creamy crackers. But they are more for a chowder. I will stick with the Sunshine Saltines.
I do cook from scratch. Or at least I think I do. All my veggies are cooked from the raw state. And I don't buy any marinated meats. I do have a butcher that I know personally, and he gives me what I want usually cut fresh from the side of the animal while I wait. He gets a truck from Chicago delivering every morning. So I guess you say I cook my meats from scratch. Condiments, flour, butter, etc. I think it is a given that for the most part we all buy and use them. That doesn't lessen our "cooking from scratch".
For those in my age group or who are handicap in their mobility, we have to depend on our local supermarket to obtain the freshest and bestest produce possible. For those who have a farmers stand or market within traveling distance, they are the fortunate ones. They can go out and buy each day what is in season and plan their days menu. For others, they can just go outside their kitchen door and pick their needs from their garden. But they still have to travel to the store for milk, condiments, etc. They are still scratch cooks.
I think the ones we wouldn't consider a scratch cook are the ones who load up their freezer with TV Dinners, frozen pies, Hot pockets for everyday lunch, Swanson breakfast entrees, Jimmy Dean Sausage Sandwiches, etc. They feed their families three meals and snacks a day out of the freezer. I believe we would call them Freezer Queens. After the freezer comes their pantry. Hamburger Helper, Kraft mac and cheese in a box, canned chili, white bread that tastes like cardboard, canned spaghetti, canned veggies over salted, instant coffee, bottled dressings, powdered and canned milk, etc. But they have the biggest set of the most expensive pans, and knives. More the sorrow for them.