People really underestimate the amount of time kids take. You may think you know, but it’s a whole other thing to live it. Wake up to kids, get kids situated for the day, work, get the kids, feed the kids, play with the kids and take them to activities, bathe the kids, put the kids to sleep. Any time for anything for you/your spouse/the house happens after they’re asleep. Sure, you can take them to the store but that causes headache. Sure, you can do housework with them around but if you’re home alone with them they’re more likely to be actively undoing anything you just did the next room over than to anything else.
Kids are a lot of fun, but they’re also a lot of work.