Well, talking to kids and explaining things to them takes time, and it’s basically work. How inconvenient.
Also, you have to know what a better way to handle a situation is. If someone’s the type of person who hits a kid for misbehavior, maybe they don’t know how to do better.
My husband and I are in our mid thirties, and are actively holding off on kids until we feel like we’ve gotten better at managing our emotions. Our parents had kids much earlier, and ended up exercising their emotional dysfunction on small children
I could be completely wrong, but my life experience so far suggests that the best way to get better at something is to put yourself into situations where you have to actually practice the skill. I’ve been fostering cats and kittens for a few years, and I think it has really pushed me to learn how to manage my emotions better.