[Huber]

But even scripture says husbands and wives are not to deny each other for long periods of time. If the claim is that a celibate/mostly abstinent marriage is good for the spirituality of the couple -then I remain skeptical.

You are, of course correct on this point.

yes...and too many pregnancies can also result in dangers to physical health - and cause a person to become so overwhelmed they find they aren’t being as good a parent as their children deserve.

This latter point is, however, one commonly employed by secular humanists, and undergirds not just many arguments for contraception, but arguments for abortion as well.

[Scotswife]

“This latter point is, however, one commonly employed by secular humanists, and undergirds not just many arguments for contraception, but arguments for abortion as well.”

but it can also be employed by someone who has tried their best to follow the teaching, but found NFP to be completely unreliable.
Someone who has been seeking advice from priests for years on this matter, and has made an honest effort to make it work.
Someone who is now pregnant with their 8th child, who is literally capable of having one baby per year and is overwhelmed.