Yes, children have thrived for millions of years without either.

Have you completely removed all influence of screens?

Personally admist the uncertainty about what effects screens have on children I oscillate between a hard entrenched but probably superstitious belief they rot brains, and excitement about the educational opportunities they provide.

Some of the discussions I have had with my daughter about YouTube/kid shows have been absolutely delightful and have proved to me that there is a positive side to it.

I'm very wary about both quantity and quality of screen time though. It is just very difficult to know where or what those limits should be without being entitely arbitrary about it.