It is a very common trope told in the patriarchy that motherhood, being pregnant, giving birth, is 'nothing special', Coralfox, but I disagree
There is nothing special or mystical about biological motherhood that makes it more important than other forms of parenthood. Fathers and non biological mothers (adoptive or in same sex relationships) are equally important, and should be treated equally.
Your statement diminishes the experience, impact and effect being a biological mother has on both mother and child. True patriarchy and fits neatly into the left wing ideas that bonds, birth and biology are not important.
Fatherhood and adoptive mothers are not equal to being the biological mother. That doesn't mean they aren't important or good, but it doesn't compare to being the biological mother. Maternity leave is not parental leave and is not just for raising the child the first months/year.
Think about: would you really say that if a mother loses a child in the last weeks of pregnancy or during birth, they shouldn't have maternity leave? Or that a mother who gives their child up for adoption or surrogacy, should be back working within a day? But adoptive parents and fathers should have the right to a year off?
Adoptive parents should have leave for the benefit of the child. Fathers should receive leave for the benefit of their bond with their child. But mothers should come first as they need recovery on top of bonding with their child.