Yes, I'd like to chime in on this.
In all honesty, by starting with a presumption of shared parenting, you take the fight out of the process. I believe that children absolutely deserve to have both parents on a level playing field when it comes to what they benefit from by having both parents involved to the maximum of their ability.
Comparing what occurred in 1997 and the way we live today, it is dramatically different. There are so many more parents of both genders who work from home with flextime, or have the ability to attend a meeting over video conferencing, that the opportunity to be at home with a child has increased dramatically. There is even less of a reason to say no to this.
Whether you are an intact home with father and mother at home 50% or 100% of the time is of no relevance. The point is that the child can depend on one of those parents being there from one moment to the next. Having that security of knowing that both of those parents are there at any given time solidifies a foundation for a child. That doesn't exist in a separated home. When children know they only get to see—in most cases—their father on weekends, that's not enough time to be a parent. In fact, 35% is not enough time, either.
Being able to step up and do the lion's share that's down the middle gives a child an opportunity to see how each gender would address how to do laundry or how to take care of a meal. These are all important life lessons for a child, and I think both men and women address those issues differently.