By that rationale Royal St George's is out-and-back?
When I think of out and back, I think of Brora. The Old Course and Deal to slightly lesser extents.
Alwoodley, Silloth and Walton Heath (Old) to even more lesser extents that you'd have a hard time saying they are "out-and-back" - but even those three are, to me, 1000% more out-and-back than Pine Valley or Pacific Dunes, for instance.
I see the argument about not having returning loops, but the way I see it there is a lot of difference between the absence of returning loops and a course being out-and-back.