I know no married couple who lived together before marriage where it was a huge benefit to their marriage. All had significant issues related to it.
None of my friends who waited said “gee, wished we had lived together first!”
Without the strength of the traditional family within marital bounds, society crumbles. It’s not if, but when.
For the most part, unmarried couples live together for economic necessity. In my case, both my future wife and I owned homes and one home was not being lived in. We moved in together, and put the empty house up for rent and earned some income. enough income to expand our real estate portfolio.