That is precisely my point. Practically every quote I’ve seen Catholics marshal to condemn ABC could just as easily be applied to NFP.
No it can’t. ABCs are either physical barriers (condoms), which interfere with the unitive properties required. Or they are hormone therapy, which interferes with implantation (the Church claims), which Catholics consider abortive in nature. NFP is neither abortive, nor interferes with the unitive properties required. So, regardless of whether you are a proponent of ABCs or a proponent of NFP, no you cannot put NFP and ABCs in the same boat. They are entirely different.
Not only that, NFP requires discernment
each time it is used, and it requires discipline especially since the woman desires the marital embrace
most when she is most fertile. This is what makes the discernement an ongoing process. ABCs do not require discernment because they are affective when used propertly.
It seems the fathers for the most part condemned anything that frustrates conception.
I have not seen one single proof of this. And a few people have asked you to provide it. I understand you though: you can’t provide it because it doesn’t exist. This is merely how you privately interpret documentation provided, and like everyone else, you have a stumbling block. With prayer and patience and trust in the Church, maybe you will overcome this stumbling block
I wonder if that’s why Humanae Vitae doesn’t contain a single patristic quote to support its teaching.
Humanae Vitae lists quite a few references after it’s completion. Either you believe the Church has the “fullness of Truth” or you don’t. Either you believe that the Pope and/or Magisterium is infallible in teachings of faith and morals, or you don’t. This encyclical is a teaching of the Pope on matters of faith and morals, and contains infallible teachings within it. If you don’t believe, then nothing can convince you of the Truths of the Church, and it’s useless to keep asking for “proof” when it keeps being given to you. Then you’re not asking for proof that NFP is allowed (because we know it is), but you are challenging the teaching ability of the Church.
Hey, I understand your frustration. I’m considered by some a Cafe Cathlolic just like you by some. There are some things I just don’t accept because I don’t understand them and they don’t make sense to me. We just choose different plates off the menu.

Isn’t that why we have been told that teachings are not up to “private interpretation”? Here, I’ll give it to you like it’s given to me in other matters: That’s why we have teachers (the Church leaders) to help us. There are hundreds of documents in the Vatican library at the disposal of the Church leaders. Surely they are more capable of understanding them than we are…we who do not have their training, education and knowledge.