Both regarding child outcomes and in historically autonomy for women was a rarity.

Though in true partnership marriages, even a fully traditional model gives the kids, women, men, and the marriage great outcomes.  The key is the adult partnership at the core.  Though that is also true in non trad marriages as well.  Two careers, etc, etc, etc... The partnership is the critical success factor across the board.

My parents have always had the prototypical traditional marriage.  Of course it has evolved over the 6+ decades they have been married.

Mom was a SAHM. Dad was the bread winner. They were and have always been each other's person and their marriage and each other have always been the core of their lives together.   They are absolute partners. Assets and resources are marital assets and resources. They are not the earner's assets and resources.  DW and I adopted that on day one of our journey.

To this day they remain two of my favorite people. Dad is a loving wicked smart highly intuitive loving and incredible woman. Just don't piss her off. That is a bad move.

Dad is her biggest fan, loves her beyond measure, as she does him, and is professionally successful, brilliant, actively involved in his marriage, and the lives of the people who are important to him.

They have always worked together on parenting, GP-ing, the housework, etc... IN retirement, he does the grocery shopping off of her list, she cooks, he cleans up after she does her culinary magic.  However, as they have progressed deeper into retirement there are things he refuses to do so he/they outsource them. That was a prickly few years of transition because my mom struggles with the parenting paradigm she was raised with. Retirement is about yard work, cooking, housecleaning, home projects, and crafting. Dad hates yard work, hates housecleaning and home projects. He does engage in an advisory capacity on mom's crafts (quilting, embroidery, jewelry making) and participates in shows, quilt runs, hunting down remote craft and quilt shops shows and fairs on their regular RV trips, etc...  

He will do the home projects though only if he deems them necessary.  He operates on the needs Vs wants model. If it needs to be done, he gets it done. If it is "not necessary" and he deems it busy work, nope.

They have a cleaning service that does the house top to bottom one day every 2nd weeks.  They have a yard helper that they engage in the high labor content yard and gardening stuff under mom's guidance and designs. Dad will help the yard helper with tree trimming, etc but pretty much refuses to dig in the dirt.  It took a while but mom finally settled into this norm though she will grumble occasionally about it.

Both mom and dad are BFFs with each other and my bride. That... leaves me in a pickle if DW and I are in a disagreement.  I can never win.

"Do you really want me to call your parents?"

DW and I have had a two career version of a moderately traditional marriage. She was a SAHM the first 4yrs of our marriage then worked PT until she completed her undergrad whole putting our kid on the school bus in the AM and meeting him at the bus stop when he got home from school. For all intents and purposes, from the kid's perspective she was a SAHM until he was about 8yo. During those years we did the dance of change on household and parenting duty distribution.  During our empty-nester years we trade off on housework depending on the work dynamic. While we were overseas, she did the cooking and shopping.  When I am between roles (at 61 finding an appropriate role is a challenge) I do the cooking, shopping, kitchen clean up, etc...   I have even been known to run a vacuum and a Swiffer over the floors upon  albeit all too rare occasion and clean a toilet, shower, bathtub, and wave a duster around.  I am eternally looking for self cleaning methods and products. But sadly they rarely live up to the hype.  So if guests are scheduled, I am Mr. Clean, and our home is spotless when the guests arrive.  Though I do get the bride side eye about it.  Her hairy eyeball delivered message is clearly "Why isn't like this all the time. Your at home, I am at work!". Her preference is a model home, mine is a lived in home.  Organized and kept but not white glove inspection ready at all times. I had enough of that crap in Military School.  I'lI generally stay ahead of the pissed off bride typhoon regarding the housekeeping.  I would outsource, but... our home is small and that makes no sense until we are both retired.

Our kid has turned out very well.  Though our marital dynamic has proven to be a challenge for him to duplicate.  He wants his version of it. I am hopeful he will find a solid version in his.

My brother and his wife have had a current version of the traditional marriage though it has been a challenge as they are not partners in the way our parents are.  Though their kids have turned out very well.  My SIL was a 9-5 mom. She dealt with the home and kids from when my brother left for work until he got home. Then, she handed it all off to my brother and he was the parent, cook, and head bottle washer from the moment he stepped in the door from work.

DW and I had the "work time" model during her SAHM years. Work time was work time. She parented and kept the home, etc... during work time while I was at work. When I got home, it was our time to deal with parenting, housework, etc...  Though for 5 of her SAHM years she was also a full time student. She was in evening classes so I the evenings were dad/kid time and my school time. I was in grad school then for 4 of those same years. I chose an online MBA to support DW finishing her undergrad.  SS and I had kid/dad time, I cooked dinner, got him bathed and ready for the evening/bed, we cleaned up the kitchen and did some laundry, and played a bit. Then we went to school. I got on the computer in our guest room/study and he sat on the daybed behind me with his books, coloring books, and crayons and we did school.  At his bed time I would put him to bed and we would read a quick bedtime story and I would get back to my studies.

I was worried about my brother for many years. He was busting his butt in his career and carrying nearly 100% of the non 9-5 burden in their family, home, and marriage.  They have landed on a comfortable balance as empty nesters.  That is a relief to me.

I agree that the kid outcome in SAHP marriages/families is often far better than in alternative models.  Particularly when gentle parenting is the default and there are few to zero boundaries, standards of performance, and standards of behavior in the kid's upbringing.  It is often a tragedy when the adult partnership at the core is not solid.