I quit buying Kraft, Best Foods, etc. years ago (unless it’s on sale cheap) and now buy the store brand. There is NO difference in the taste, especially in pasta salads and dressings where other flavorings take over. The Fred Meyer brand was $1.50 for years and now it’s gone up to $2.19, which is still a bargain compared to the name brands. Give it a try—trust me, you won’t notice a difference.
I noticed a difference between Kraft Cheese and Kroger Brand Cheese.....also with some other products...you’re mostly correct but that rule isn’t operative all the time.
The trick is to research where the premium brands are made and by whom, and where the store-brands are made and by whom. There are instances where only the label is different.