In my first marriage, I was the sole breadwinner 95% of the time. My ex-wife did have a part time retail job for a few months before she got pregnant, and then that ended.
I still contributed at home though. Before we had a kid, I would clean the house (dishes, laundry, picking things up, etc.). It would feel weird not to. After our daughter was born, I did that, and also helped raising our daughter. I shared time trying to get her to fall asleep, fed her, and so on. I was even the primary diaper-changer as long as I was home, because it didn’t gross me out as much as it did my ex. I’m glad for all of that, because otherwise I would have missed out on a lot of time with my oldest daughter. And later, after my first wife and I divorced, my daughter and I ended up on opposite sides of the country, so that time I’d had with her as a baby and toddler was even more important to have. If I’d just been a “you take care of the kid, I bring home the money” type of person, I don’t know if we’d have had the bond we have. (My oldest is turning 20 this year, and we are still close, or at least as close as you can be with someone you only see in person every once in a rare while.)
I’ve also been on the other side. I once lived with a woman (fiancée though we never married) for six months, and due to some very unfortunate circumstances I was unemployed for that entire time. But she had a well-paying job as a lead nurse at a major hospital, so we had no financial problems, and I had no need to work. I was freaking miserable. I was pretty young (22) and it was a revelation to me that being able to stay at home every day and not worry about money was a nightmare. I did my best to keep busy; I cleaned, did yard work, and so on. But it destroyed my self-esteem. I needed some kind of work to feel like I had a purpose, and being the live-in maid didn’t work for me.
Today, my current wife and I both have good careers. We make decent money; not “we can do and buy anything we want any time” kind of money, but the kind of money where we don’t have to stress about finances all the time. We share household duties, though in a weird way; I tend to do the everyday things (I do stuff like dishes, laundry, pick up after everyone) and every now and then she goes crazy and does some huge cleaning project on something. We’ve raised our daughter together, and I was lucky to already be experienced when she was born as I was already a pro at things like diaper changes (again, I was the main diaper-changer), feeding, swaddling, soothing a kid to sleep, etc.
I think having a balanced partnership has been a lot smoother and more stable than my previous relationships were, where either I was the sole breadwinner, or my partner was.