The trunk lid is so small and light. It is not at all like the heavy hatch of the S. I guess there are a few people who need, must have, cannot make it without an automatic trunk lid lifter, but really, MOST of us don't have "2" kids and a trunk full of groceries. I never had one on my Toyotas or Cheby. With 2 kids. This whole discussion is almost beyond my comprehension. Do the doors open when you wave your foot? How about the frunk? I have the S and the 3, and I don't see the benefit of auto trunk.
Just for reference, we haul 4 grandkids around at times. But we don't put any in the trunk, so there you go.