@ TightSlot ... excuse me, I'm still giggling at that superb riposte!!
OK - REAR-facing Pax have different harness and seats. I'm just puzzled by the different [and indeed apparently variable] postures. You have highlighted some of that, for which thanks.
"... when you clearly know little about the technical aspects." Please skip the
ad hominems. I started flying in 1963, I'm not an aviation idiot. I was asking a genuine question.