Everyone has a different take on this, I think to some extent it may depend how you were raised (how your parents handled money) and if they got divorced or not. Here's my personal take:
When we got married neither of us had 'significant' assets, both of our sets of parents had a collaborative mindset, so we decided that everything we built together financially would be 'ours', not 'mine/yours'. Both paychecks go into a joint account, investments are joint accounts to the extent possible. We have separate 401k/IRAs but they are viewed as communal retirement assets. We each have a small 'discressionary' fund for fun money but it's small...a couple thousand bucks each.
In my mind this is fair, i make 75% of the household income, but my wife contributes far more to other aspects of the household that aren't financial but are essential. We have a simple written agreement that is not a 'pre-nup' persay but is something along those lines, that says if we were to divorce we will add up everything we have and chop it in half. It's probably not legally enforceable but we are both smart people, I would hope if it came to that we could both realize it's better to chop things in half than to get bitter about it and let the lawyers take half off what we are fighting over. I don't see it happening, but i guess nobody ever gets married intending to get divorced.
I don't think you are being unfair in your arrangement, if your wife quit her job to take care of the household or children, it makes sense. Perhaps if you are set on having 'your/mine' type money arrangement you can work out what a fair 'wage' is for her staying home, that goes into her account, and then whatever is left over you can keep.