I think that Justbecause must be thinking the boy and the girl’s parents live in the same metro area.
We live out of town (Connecticut) Our son dated both at Yeshiva in NY and in Israel. It would have been very inconvenient for us to have a set number of dates after which we would require meeting the girl.
He ended up marrying a girl he was set up with while in Israel, we met her at JFK when she had a layover flying back from Israel and changing planes for Miami. I have no idea if they had been on 4 dates or 10. We met her for 90 minutes. We then had a long phone conversation with our son and made arrangements to fly to Florida and meet her parents.
OTOH, our daughters went to school in NYC. If they reached the stage of wanting to go out a 4th time with a boy, we would drive in on a Sunday afternoon to meet him for coffee. In both daughters’ cases they ended up marrying brothers of their school room mates and had already met the parents when they came to bring their daughters to school or when our girls went as guests to the room mates homes.