If I make more money, and my spouse and I agree to split expenses evenly and keep our separate finances, and as a result I'm enjoying luxuries without them because they can't afford them, I hardly see how my spouse is more equal in this scenario. They'll probably resent me for not sharing my good fortune with them, and it will absolutely still lead to bad power dynamics in a relationship. If we don't split expenses evenly because I make more so that we can end up with roughly an equal amount of "fun money" each in the end, then it's just shared finances with extra steps and constant adjustment of percentage expense burden as relative incomes change.
Most couples will try to cover shared expenses with their combined income and then equally distribute the remainder, so that neither of you is left wanting. Of course if you're the one making significantly more (or a sole income provider) you might see this arrangement as mooching or unfair as you're contributing more. But there's more dimensions you can contribute to in a relationship than just financial, and hopefully both partners can recognize that.
