Ita actually extremely difficult to keep father's and dc apart
No it isn't. It isn't at all, especially when the child in question is still a baby. They will not granted unsupervised visits for months, then no nights until baby has stopped breastfeeding, which can be years.
Try to build a bond with a baby you only see a couple of hours, in a public area, especially when the mother will do anything for the father to dissapear, introduced a new man in her life who gets to spend every day and night with a child, who will inevitably bond more with that man.
Had to this when the mother moves miles away and it's up to the father to travel hours to spend a couple of hours with his child, with the child who might be tired, hungry, grumpy, and not much interested in spending time with this man who doesn't mean much to them, hence making the experience nothing much rewarding.
Yes, going to court is easy, but the investment expected from a nrp can be such that with a mother on a mission to get him out of the way, it becomes much heartbreaking and totally disheartning.