Because that's what marriage is. If you don't like it, there's an easy solution - don't marry. You can do practically everything - from sex to going to movies together to emotionally supporting - without being married. If the concept of sharing your life with another person sounds weird - just don't do it. It's not mandatory, you know.
No, there are different kinds of marriages. One can have an agreement that past and future assets are not divided. If you don't like it, don't get such an agreement.
>If the concept of sharing your life with another person sounds weird - just don't do it.
Sharing your life with another person doesn't imply sharing property.
