Think beyond dating. If they want to get a place together, do they have the combined resources to swing rent?

It's not like everyone lives on a farm anymore. You probably can't just build a starter house on the other side of her dad's back 40 acres.

Rent gets a lot easier when its two earners splitting a one bedroom or even a studio

Sure, but that's true with platonic roommates, too, right?

Usually platonic roommates are less willing to share a one-bedroom, much less a studio.