I think people have someone served who are not living together, and who don't want any excuses of "I never saw any D papers".
I had my ex served while we were living together. In my state only an adult not a party to the case can serve divorce papers. I've seen people evade sheriffs for months, so I paid maybe ~$75 more for a pro server to guarantee service within 48hrs. I got to watch them do it. There was a knock on the door. I said, "Can you get that?" My ex opened the door to someone in a deliver-like outfit. He handed her an envelop and said, "Please sign here for the delivery." He was gone by the time she knew what had happened.
