Good points you make Arizona.
There are so many variables it becomes impossible to make one list.
We try to go to places in the winter where we are unlikely to see anyone else. I think that SAR would be unlikely to be able to do a rescue before nightfall. We did have a climbing partner rescued by helicopter off he top of a mountain a few years ago, but that I think would be the exception. That is to say, I firmly believe that everyone in the party should have enough gear to survive an unexpected night out with a modicum of comfort.
I my self have never had to spend an unexpected night out, but really close a few times where we walked out at midnight in a storm. A good headlamp can be a survival tool!