unicornchaser - there are lots of reasons a NRP would ask for 50/50
He may genuinely want to care and parent the children
or
He may feel entitled to have the children but have no genuine desire or know-how to parent
He may wish to not pay or pay as little as possible CM, or they fear the asset split will be more favorable to the RP if the children are there most of the time
Control or simply an attitude of revenge towards the other parent, yes hurting the other parent through the kids is fairly common side effect of divorce
50-50 default care gives the benefit of the doubt to the NRP and doesn't consider the child's best interest
It makes a lot more sense to look at how a parent behaved prior to breakup as it is a strong indication of how the relationship with the children will continue.
Why should an absentee father, one who never cared much for the kids be suddenly considered a competent parent? It makes no sense. If he demonstrated years of neglect why would they suddenly become good parents
In addition, children don't just get used to it. Perhaps the biggest convenience misconception is that "children are resilient". They adjust and adapt but they suffer sooo much, many are left with life long scars and some never adjust. Some have self esteem problems, depression, anxiety. This conception is there to put the divorcing parents minds at ease but it doesn't do justice to the children.
I would love to be in a situation where 50/50 would work for the kids, it would allow me to expand my career a lot faster, it would benefit me financially. In my dreams my ex would be a caring parent who would be proud of the kids and happy to do things for them, my kids would feel safe and loved and valued in both houses. It is not the case though. But he does ask for 50/50 and has threatened me to go for full custody.
If 50/50 was the norm I fear my kids would be severely damaged emotionally, their education would suffer and, given the considerable differences between the two households and how they function, they would not feel they have two homes, but two different bed stays.
In the future, if the children will feel at ease with the dad and how he treats them, if their relationship will become one of care and mutual respect, I will happily consider a 50/50. But I don't hold my breath for it.
Those of you who can never fathom the situation where you would have to seriously consider the safety and happiness of your children because it is a given are really fortunate. Just don't assume it is a universal rule. Plenty parents are not as lucky and what they don't agree with the 50/50 it is because they put the well being of their children first.