It looks like taxes increase and any kind of post-life planning can be done with a few legal filings rather than getting married. Is there any real benefit? It kinda seems like it’s just a way to trap people in relationships, probably traditionally, the woman.
Mellvar posted a bunch, but ones like immigration and naturalization are huge, as the process for becoming a citizen- especially while of working age- is huge. Having your husband or wife by your side and not limited to trips across the border once a month is really nice.