Me and mrsmidlife have managed 27 years so far without anyone muttering incantations over our rings.
That’s great. But when one of you dies it’s going to be very messy.
The simple fact is that the most valuable aspect of marriage (or civil union) is that it is recognised as binding by the state. That recognition, which cannot easily be undone, is why marriage is both a sentimental and a rational engagement.
What I mean is, making a commitment to your partner is one thing, standing up and saying to everyone else, formally, and with a binding contract to it, is another. I am not saying that everyone needs or should make that extra degree of commitment, but I am saying that for a lot of people, it’s that very public statement that makes it special.