I mean, at least a baby should be breastfed (as in a balance between formula and breastmilk) while there are those who solely use formula as their main means of feeding the baby but later in life that child has issues with their immunity like being susceptible on illnesses that are typically not fatal for most people.
That’s because breastmilk has all the nutrients to strengthen immunity later in life for a child. There is a difference between breastmilk and powdered milk: since formula is composed of numerous chemicals (it’s made from compounds) while breastmilk is from the mother. Is breastmilk healthier than formula?
Following your logic, we should also only eat non processed meat and vegetables. Goodbye Kraft Mac and cheese, sodas, etc. Because compounds.
Breast is best except when it isn’t. (Supply issues come into play, some babies don’t latch, soreness, etc can all happen). Fed is always going to be best and you do what you can. We had three with all different experiences. No differences we can tell years later.
Following their logic we should just starve to death because chemicals and compounds…aka everything we eat, drink, and breathe.