> Anecdotally, once I fully took on the duties of breadwinner our relationship really transformed into the healthiest and most stable it's ever been. She pursues her creative passions and I get the joy of watching her grow.
The problem here is the power imbalance. At least in the US, she has the power to divorce you at any time for no reason and date a different man, and you still have to support her with alimony/child support as if you were still together, but she of course no longer has to do any home making duties for you. It's a terrible deal for the breadwinner (generally the man). If you work a stressful but high paying job, you permanently lose the option to choose a lower stress lower paying job because the family court will assess your earning potential based on the high paying job and expect you to pay her forever based on that.