Why get married? Typically there’s a wedding. That’s a ceremony involving you, your partner, both partners’ family and friends, and a religious and/or civic authority. You’re throwing a big party saying “we are committed to each other”.
When you’re very religious, this is required to become partnered and accepted as an adult in the community.
When you’re not religious, this is an incredibly expensive way of getting a bunch of other people involved in your relationship, which has a 50/50 chance of ending despite the life vows.
For some it might be beautiful. For others, there’s just no real point to it.
Personally, I’d be interested in a ceremony celebrating a commitment to cohabitation and partnership that sheds the baggage of a wedding and marriage. Something like a domestic partnership housewarming party.