All of those things were part of what I did, as well as cleaning the house in evenings, planning activities/trips, hospital visits, managing travel, bottle prep/cooking, playdates. I would stay for multiple days (typically 4-7 at a time) in a row every time we were together. Often create an environment for my partner to take a day or two off. They are an individual much earlier than you would expect. I concede I would get a ~2 weeks off in between to catch up on work and grad school, in a different city. They were always on, which is way more work.
Hardest part was that I had to relearn everything often, cuz if it's not everyday it doesn't stick with you the same way, and you have to catch up to the kids new preferences.