This isn't just an old wives' tale. It's true that the stuffing can get soaked with turkey juices but not cook to a high enough temperature to be safe as it's buried deep inside the bird. Besides, there would never be enough stuffing to go around to give everyone an ample portion (not to mention seconds and leftovers).
My family frequently duplicated the basics of Thanksgiving dinner for Christmas dinner as well, and I always welcomed the opportunity to have turkey and dressing in December, too. We've gotten away from that habit, but really you can have turkey and dressing -- or chicken and dressing -- any time of year.
My mother did not have a written recipe for her dressing. She worked with some basic ratios but this was mostly a recipe that she made by look and feel. I've continued in this vein, but given that I only make this once per year at best, I decided to document what I did last year. So, with a few tweaks, this is essentially my mother's dressing. We frequently prepare a double recipe so that we can enjoy leftovers the next day, and have enough for guests to take some home if they like.
My family frequently duplicated the basics of Thanksgiving dinner for Christmas dinner as well, and I always welcomed the opportunity to have turkey and dressing in December, too. We've gotten away from that habit, but really you can have turkey and dressing -- or chicken and dressing -- any time of year.