Agree to some extend but it's not just about getting married or not. It's about being able to commit to a long term relationship. Nobody needs to get married these days but it also feels that a lot of relationships don't even last longer than a couple of months...
Thanks for the comment!
Humans aren't great at intuitively valuing long-term decisions, so why would it be good to commit to a long-term relationship?
It seems to be optimal to be non-commital, if only for the freedom it grants you.