IIRC the orthotropics explanation for this is because we have much easier to chew foods, we chew much less and have poor tongue posture, leading to skinnier int

IIRC the orthotropics explanation for this is because we have much easier to chew foods, we chew much less and have poor tongue posture, leading to skinnier inter-molar width (IMW) and jawbones that are more down and in as opposed to up and out