The degrees to which this is emphasized on is different depending on your leaders. When my full-time working mother taught young women's, she came at this question with a bit more liberalism. But when some other, nameless people attacked this question... let's just say liberalism was a polar opposite.
Anyways, what needs to happen for the couple to get married? A wedding! As a Mormon boy who grew up in Mormon culture and knew lots of Mormons and had three Mormon siblings get married, I should be an expert at weddings, right?
Wrong. I was never allowed into the temple. I've legit never seen or attended a wedding. Never. I've been to ton of receptions, but never a marriage. Until yesterday, I though wedding rehearsals were something only in the movies (give me a break, I grew up with Mormon culture). If you are too young, you are not holy enough to see a wedding, even when it is your own brother. Even worse, if you are not in the church, you can't see someone you love get married. It is not allowed. You are excluded. And exclusion always makes things more sacred, so this sort of exclusion is good, right?
Never been to a wedding. I'm not holy enough to witness one. It sucks.
This is why I vote we do it the British way. Weddings must be public so anyone can attend. Afterwords (usually several weeks) people go to the temple to get sealed. And their weddings are just as celebrated, just as holy, just as sacred. And they don't demand exclusion. So... to the British way!