Agree with both the above.
My DP's ex insisted on 50/50 in the belief he wouldn't pay any maintenance, CSA soon proved him wrong but he only paid about three times then stopped again.
Like the above, he enrolled them in various activities and sports and then deducted the fees from the maintenance as he saw that as his contribution. The sports bill has pretty much gone now but still not a penny.
And the same thing with making decisions on our behalf and then expecting us to pay or facilitate. And that only works in one direction. We're busy arguing over something he's trying to arrange for him to do with DSD in our week because he can't do it in his!
We buy all the casual clothes, sanitary products and make up for the girls because he won't buy them, we spend a lot of money on fresh food so they have something healthy and tasty to eat. He buys them iPhones and sports gear for the sports he's chosen for them, and ready meals.
So the kids pack up all their nice things and take them with them when they go, and bring some of them back again !!
You just have different existences for the kids, even if you're able to try and agree on stuff it'll still be different.
I'd say the biggest choice you have is which dy you handover. We used to get the kids on a Friday, they'd be tired and dirty, then it switched to a Sunday night which wasn't so good. We're now on Monday switch over, they go to school in the morning and to the other parent at the end of the school day.
Except we then have togomround to pick up all their stuff! :-0