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As far as I have been able to tell from research on the subject;

a) studies don't really adequately differentiate ACTIVE activities versus passive ones in evaluations of screen time, particularly with children under 10, and

This is correct. (I follow this research very closely for work.) There's a little bit of research on toddlers and interactive books showing that that is a...weird interaction, but that's about it. Someone needs to GET ON THIS already.