There are differences in favor of breastfeeding. You can look them up if you care to. However encouraging breastfeeding has killed babies when mothers tried to force it despite the below making it impossible. Thus fed is best applies even though breast feeding is better - the difference is stastically there but not that much.

However breastfeeding is hard! Most don’t appreciate how hard it is in the modern world. It was 'designed for a world where mom was never more than a few steps from babp. Women’s work is historically (acoup.blog has a whole series on this) defined as the work mom can do while breastfeeding and thus mens work is anything that can’t.

modern offices don’t allow for mom to take the baby to work every day. Many have private spaces to pump which can work, but not well. Problem is you need to manage supply which is hard to do correctly. also when mom gets home they want to switch to breastfeeding but baby is used to the bottle and doesn’t suck hard enough to get fed. It is too easy to give up on the whole thing because it is so hard.

on top of that formula makers are sending free formula samples those first hard months - use those a just a couple times in a row and mom dries up forever. (Or until next baby)

finally not all mothers have nutrious milk, some babies histrically died because mother was porducing ‘water’ not milk. Also some babies are allergic to milk. These are both rare cases overall but they happen.