I agree, and I do not think you are being difficult. Marriage has two inseparable purposes, the procreation and education of children, and unity of spouses. Does the newly married couple need a few months to practice their unity, or are they going to be faithful to each other and begin helping each other reach heaven right from the start? Put another way, the other characteristics, so to speak, of married love - - it is free, total, and faithful - - will all be practiced and present from the start; is the fruitful aspect to be delayed without just reason?
That being said, I do acknowledge that the Church entrusts the evaluation of just/serious reasons to the couple, but I am not sure how well that message is getting across. I further suggest that a few months of NFP based periodic abstinence may illustrate whether a couple’s reasons were as just or serious as initially thought.
ETA: and welcome, man who wonders!