First let's not get into formula vs breast. That's not relavant right now since formula is designed to imitate breast.

I am aware that cows milk is not sufficient for babies. The approx age is one. The (main) reason is iron. By one most (western) children eat a sufficient diet that cows milk is a sufficient milk source.

My concern is that some parents may see the anti cows milk propaganda and not provide any milk after weaning (almond, oat etc drinks are not milk).