I have kids and when I took them on trips when they were little, I would book the most direct option. I didn't consider the option where I could inconvenience the most entitled people.
I'll never get why people get so worked up by babies crying on airplanes. The kids parents are just trying to get somewhere, same as everyone else. The plane is not your bedroom, or office, theater, or library. You know what you're getting into when you board. You're going to be in close quarters with strangers. Some of them might be kids that cry, some might be so old or weak that they have trouble stuffing their oversized carry on into the overhead bin. The difference is the weak person could have chosen to check the bag. Can you tell what my flying pet annoyance is? You just never know what you're gonna get.
Like someone already said, the airlines don't do it bc there's no money in it.