[naasking]

> And the repression of some of these in modern humans causes considerable psychological distress and anxiety.

Literally pure conjecture, as there's no conclusive evidence of this claim, which is the whole point of this article.

Furthermore, the only change we're discussing is eliminating a specific type of co-sleeping. All of the other behaviours common to all mammals remain the same. The odds of this one change being significantly damaging are small, and considering we see no strong signal in the data we do have, I don't see this claim standing the test of time.