What I would struggle with is if the Church condemns NFP if the couple uses it with a "contraceptive mentality", as I said above.
Remember that the Church in her moral discernment draws a distinction between actions, motivations, and circumstances. NFP is a moral method/action of spacing births. The motivations of individuals can be wrong. They practice NFP for the wrong reason. That doesn't make NFP illicit, just a person's motivation for using it. It's essential to understand that distinction when breathing "Catholic air."
It is being used to control when pregnancies occur via natural means, while at the same time fulfilling natural human desires that NEED to be fulfilled at some point or another, at least for most couples. Would that be considered a contraceptive mentality?
I don't think so. Honestly I am not of the "Catholic Amish" school of thought on this, and I know many clergy who are not, but are completely orthodox.
For instance, a close Priest friend of mine was once invited to a house to celebrate the birth of a man's 13th child. My friend said, "Why should I go to congratulate him for that? The man may just be oversexed...and his poor wife, she was pregnant for almost 13 years of her life?!"
That is not to say, by the way, that having 13 children is wrong. But there is a sense in some orthodox Catholics that more kids equal better Catholic practice.
I think an unfortunate counter-reaction to dissent on the teaching of birth control is the overemphasis on "numerical fecundity."
I remember when I entered Seminary the Vocation Director looked at me eschew when I mentioned that I was an only child (which is becoming more and more common), because somehow it reflected badly on my parents that they didn't have more than one child. It wasn't even considered my Mom has a very serious chronic disease and I was born as a high risk pregnancy. My parents practiced NFP.
We have to remember especially that after the Industrial Revolution but before the introduction of the pill, it was common for couples to occasionally sleep in separate rooms, to be modest even with each other, so that they didn't "test fate." This may not have been necessary when infant mortality was high, but now especially self-control is.