Very true...

We also typically don't integrate the values of all other adult humans - instead we assign weights to their values, strongly correlated with their distance from our own values.

People don't practice humanity-wide CEV. We have multiculturalism - agreements not to influence each other's values excessively - but not "value trading" where each side agrees to change their values towards the mean. (Many people / cultures like to pretend that values cannot or should not be deliberately changed at all.) I don't have a firm opinion on how much of this is cultural, accidental, or liable to change in the near future.