And while I would not be in favor of any state or religious requirement, I still wish it were just more widely done. Call it a marriage mindfulness weekend, make it a social norm as strong as sending "save-the-dates".
It was wild to go to a marriage prep event and see couples right next to us start yelling at each other "what do you mean you want kids?" or "why would I quit my job?" I don't know how you get engaged without knowing these things already.
For us, it led to some really good, deep conversations on what we wanted the future to be like. We were already largely aligned on practical things, but learned even more about some of our deepest dreams. And the style of conversation we practiced is still routinely useful when we get misaligned and need to talk about our hopes before we even start debating some concrete decision.