Congratulations, you don't have motion sickness. I think that post was referring to those who do.

For those people, rear-facing seats can exacerbate motion sickness. See e.g. https://www.sciencedirect.com/science/article/abs/pii/S00036...

> rear-facing seat of my family's circa 1970 Plymouth Satellite station wagon growing up. Completely unsafe,

I am curious: Unsafe because a " 1970 Plymouth Satellite" or because "rear-facing seat"?