Earlier quoted context omitted.
> What I’m interested in though is the objective reality of this matter, i.e. whether or not diversity is beneficial for child’s development. There isn't an objective reality. Depending on what you personally value, diversity could be a cost, benefit, or neutral for your children. You may not even know the results until much later, and even then it will be hard to discern the causal factors, though you may try to pos…
There certainly is an objective reality. It may be very hard to determine what it is, but it nevertheless exists. In this case, as long as you define developmental goals (ex. the child develops into kind, responsible, emotionally stable adult etc.), the policies/circumstances, such as being raised in a diverse environment, being allowed to watch TV, studying a lot, always wearing black socks etc. will or will not hav…
An objective reality with child-rearing? Apart from obvious things like not ignoring or abusing a child, there isn't one in my experience, but as they say ... whatever works for you.
> the policies/circumstances, such as being raised in a diverse environment, being allowed to watch TV, studying a lot, always wearing black socks etc. will or will not have impact (positive or negative) on those goals.
At best, perhaps raising kids in diverse environments allows them to be resilient in diverse environments as adults. At worst, it could cause them to harbor resentments against others nearby who are different than them. You can find kind, responsible, emotionally stable adults who were raised in both diverse and non-diverse environments. And you can find the opposite in both types of environments.