I'm in two minds about story progression, I like how the other people in town come and go and age, but I was not impressed when I switched households a few weeks ago and found over the course of three day, three of my single sims had married! Granted, one had married his sweetheart, who I had intended him to marry, but of the other two, one was going to be a single man most of his life. For this reason, I use Awsome mod and make the households I play sacred so that when I switch between families, I don't find one of them has moved out of town!