I think the opposite is true too, though, that women go online and see that the most commonly cited study says it is 99.4% effective and don’t read the research behind it. In that study, they started out with 1599 women, then cut it down to 900, then cut it down to just 201 because they excluded all of the women for whom NFP would not be effective - women who have given birth within the past 6 months, breastfeeding women, women who have had an abortion, women who had taken birth control pills, women under age 19, women over age 45, ones that had long or short cycles, woman with any history of fertility problems even if they were later corrected, and women who got pregnant using NFP at the start of the study. They ended up cutting 87% of the women from the total data set, which left only a very small, highly-cherrypicked group of women. And even among those women they selected because nfp would work better for them than the average population, the over all effectiveness rate was just 91%. It was only the perfect use that was so high. Rates for the average women, who is overwhelming likely to have at least one of the issues that would make nfp less effective, are bound to be lower. Perhaps much lower.
Faithful Catholics are going to use NFP regardless of effectiveness, marketing, or how happy or miserable it makes them. There’s no need to manipulate data or lie about how hard it is or how much abstinence is required (CCL admits many of its instructors do that) because if you want to get to Heaven, you have no choice. It’s not like you can decide that ABC is easier and more effective and decide to jump ship and use it. I’d much rather seen honest talk about NFP rather than discussions on how to make it appear better than it really is.