For most of recorded human history, women have given birth surrounded by neighbors, friends, mothers, sisters, in-laws, etc.
Communal childbirth is not a "trendlet." In fact, it is more in line with historical norms than the 20th-century idea that birth should be "private." The major difference between modern communal childbirth and historical communal childbirth is that modern fathers are usually expected to participate (though other male relatives often aren't).
Anyway, congrats to Sara and Ev — don't let the historical amnesiacs who rule the Mommy Wars get you down.