Me and my OH have always split everything 50/50. Been together almost 3 year, engaged since July but trying for a baby before we get married (as I'm 39). He earns slightly more than me annually and his bonuses are bigger but I only work 4 days a week, so if I did 5, I'd out earn him. I previously out earned him by a significant amount before I changed career and dropped to 4 days but we have always done 50/50.
We each have our own accounts which our pay goes into and we each have a rental property so our rent goes into our own accounts too. We then have a joint account which the mortgage payments come out of (we put the money in 50/50) and same will bills. We then have a credit card which is mine, but he is an additional card holder. All our spending goes on there (food shops, eating out, holidays, cinema etc) and we pay it off 50/50. The remainder of our money is ours to do what we like with. OH will usually invest his in shares whereas I'm more of a saver. If he wants music or camera equipment (his hobbies) then he buys with his money. If I want things (clothes or whatever) then I buy with my money.
He technically "owes" me 25k as I put more in for the house we bought jointly earlier this year but now we're engaged and trying for a baby I'm less bothered about it. Plan is if we need to extend in future he will put more in or sell his rental flat to put more in and it gets "repaid" that way.
I agree financial independence is important and I've retained my property in london in my sole name and with no contributions from OH for that reason. It's now worth about 450k and only 96k left on mortgage so I figure if sh1t ever hits fan I have that. But for general running of household, it makes sense to do it as we do.
I suppose in future he might pay more as his career is now likely to take off, whereas I've switched to a less demanding role, partially because it will be easier to cope if we have a family. So I guess he may end up paying more then. But, apart from our respective rental properties, even though we have our own "spending" money I think we probably do view our disposable income as joint money.