Unclear how to recreate that for the next generation. Taking away cell phones isn’t likely. More camping trips? Explicit trust extended to go dark?
Make sure they can contact you in case of emergencies, make sure they know your address/phone number, and wave goodbye.
(Obviously if you live near poisonous/venomous things then warn them about that, and set some boundaries.)
Of course we now know that pervasive access vector has been enshittified by Google/Apple and the associated social media mafias to assault children's minds with the unrestrained/unregulated full arsenal of the advertising psychological manipulation playbook.
Parents are simply regressing/withdrawing from the sheer assault of unyeilding economic stress/disruption, negative news floods, information intrusion, dual incomes, etc. That passes on to the kids.