Basically, literally all the people I know who are divorced with children are going through some horrible shit re co-parenting. A few friends/ family members I know who dated divorced dads ended breaking up apparently successful relationships because they couldn't handle the constant presence of the mother / constant change of plans / always needing to be in touch over the kids. My closest friend is a divorced mother of two and she jokes, ("jokes") that the amount of time she and the father of the children spend arguing and on the phone with each other is more than the time he spends with his OW. And they are still in and out of family court SEVEN years after their divorce.
I am undergoing divorce. In my case, the father of my two children has buggered off to another country. Although I feel abandoned and horrified by the responsibility of bringing my kids up by myself, I have other people tell me "you are so lucky!!" b/c the father is out of the picture. I don't feel lucky AT ALL!
Maybe I just know unusually acrimonious bitter people, and "amicable co-parenting" isn't in fact a myth?