I personally am not into the nickel and diming approach I see some do and think it can be used in a manipulative and abusive way. I admit I have not seen a trend to argue for each to contribute 50% of the shared expenses, ignoring the actual incomes brought in. Seems more like a roommate arrangement to me which might work for well, roommates, but often does not work so well for families where decisions about where to live, about children/childcare, about whose job to “follow” if one needs to move, etc all are decisions that impact everyone. If a couple decided to move for a great job opportunity for one partner, and other partner has a hard time finding decent paying work in the new location, I don’t think it is fair to expect the second to contribute “50%” of household expenses. Same if as a couple you decide one of you will stay home to raise young children.
Where I do see something like that it is more a percentage based on the ratios of incomes earned. So if one partner makes $70,000 and one makes $30,000, the first contributes 70% and the latter 30% but I still don’t find that ideal for my own personal life for reasons of left over disposable income, tax obligations, etc. I also still find it really...I don’t know, uncomfortable for my own reasons. It still comes across to me as a “me versus them” dynamic. In my own marriage, I like to celebrate our financial wins and successes as a team, and endure the hardships as well as a team.
My husband and I do the one pot approach - it all goes in one pot and it all comes out of one pot. We both work but my income ranges from 6-10x more than his. We both work hard, it’s just the way he is compensated versus how I am. I see my higher income as something to be used to benefit us both not as “all mine”. Like if we are going on holiday if I want to stay in the nicer place, then we both are staying in the nicer place. I am not expecting him to stay in a less desirable place commensurate with his income, or to “give me more money” to stay in the hotel I want that I can afford.
We are childfree. I do think having children can add a very different dynamic as I have seen even very egalitarian couples end up with that dynamic impacted significantly after children. It’s not difficult for me to see that resentment can breed in those situations - for everyone - and communication can breakdown. Indeed, I have seen it happen to couples I know. The couple who once thought the other could do no wrong is now full of snipes and gripes about each other, including on the financial end (and yes, often laced with misogyny too - another reason why I don’t think men can ever be feminists, some can be allies yes, but that is as far as it gets).
We both do take care of the household itself but I do have long hours outside the home so he does a bit more - and actually I choose to outsource a lot of the work time to time (meal prep/planning services, cleaning services). That’s my own choice though because due to our work commitments I think we both can spend free time on other things - including with each other - than scrubbing the shower. There are times one or both of us have to be out of town for work for a period of time and it makes it a bit easier for the remaining partner. If it was just me on my own for example I would live in a smaller, maintenance free condo, and he would also be in his own smaller place. But we aren’t on our own, and while our house is still not very big it is big for one person in my opinion, so We try and make it a bit easier on us both. Other than that we are both as capable of taking out the trash, emptying the dishwasher, scrubbing the toilet, shovelling the driveway as the other and we both have eyes: if we see something needs to be done we do it.
There was a period of time where my husband was the higher earner, but the approach above was the same.