> That’s what 99% of people buy anyway

Until there's one less common thing you want. If you don't care much about flavour or have no taste in products then you can sub in any crap food or product.

I go to a particular supermarket because it has the tomatoes I like: they just can't be substituted. It also has an uncommon milk that is the only one I really like. The issue gets harder once you desire specific Deli foods.

How much of SKU selection is driven by individual consumer tastes? Some brand selection is driven by other causes.