I don't agree with that reasoning at all. It may be true for some people, but it's a poor generalization.

I married my first and we were high school sweet hearts. I'm only 26 so "ever after" is a ways to go but things are going well. From a purely practical point of view she is about as perfect as is reasonable. It's still easy to have long conversations, we hang out without hanging out too much, and we trust each other emphatically.

The downside is that as we age different things become important to us and people change. There are things about her I appreciate more and other parts that I would ideally choose to be different. I'm sure the same is true in reverse. We are both willing to adapt somewhat to those wants and needs so there's some fulfillment.

The only other option would be to keep waiting for someone who is more perfect of a match but that isn't going to happen. I would end up dating someone or some "type" of girl for X years until my next life cycle starts and never get married. The stability of marriage works and again, from a practical view it's unlikely I find someone more compatible than my current wife so that would be a poor risk. It would be like playing poker, getting knocked down to one big blind of chips left with 6 more hands til I had to pay and throwing away QQ because it wasn't good enough.