I think you need to let it go. Unfortunately you don't get a say in how he parents. You may realize that he and the kids are missing out with the way he choices to do things, but it is his choice and you cannt interfere in that. It is his responsibility to foster and design his relationship with his kids. All you can do is work on your own.

And truthfully, it doesn't sound too different in routine to many working parents (and possibly non working parents too) who have full custody of their children.