I've been there with my wife and I'm only the husband.
Everything you say is true, but by saying this and in this manner, you lack empathy. You sound just like the mommy blogs and their followers that I'm speaking against who spout facts with no room for life's situations. My wife sincerely believed she was less of a mother because of people like this.
I say it again: Formula is _perfectly_ fine. Use it a little or as a total replacement. You're not a lesser mother/parent for it.
Acknowledging that formula is a safe alternative and that you don't need to stress.