Earlier quoted context omitted.
> And now I need to either disable everything or figure out how to turn that off for her. Why? I tell me 6yo "That's for adults only, children are not allowed to use it" and not have to worry. Sure, he'll push boundaries here and there, but with some things he knows "No means no" and doesn't push those boundaries. I have literally tested this: left a cookie on the table (that he wants) and told him "You can eat that…
You tested it, i doubt you authored it. A paternal twin can have one with good impulse control and another who's more instinctual. Even in the same family and upbringing.
Sure it happens, but it's unlikely.
It's why kids from certain cultures achieve better academic success on average than kids from other cultures, on average: the environment matters a lot.