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You're right, my original question was poorly worded.

My point is to distinguish what young children do with their screens: they could be learning things through educational games or videos for example.

Apple TV is an available option though. Saying "screen time" vs "low effort stimulating content" muddies the conversation around it being the screen itself and not the contents of the media.

But if you're interested in the science of it, it makes sense to distinguish screen time in the abstract, like using a screen for any purpose, from engagement with specific content.

Me, I'd hypothesize little if any difference between the rare encyclopedia-reading 4-year-old and the drivel-watching 4-year-old, as my personal unscientific belief is that it's about socialization with family and peers, not content.

But I'd be super interested in science teasing apart those effects.

If your position is just "most parents suck, who needs evidence?", that's valid too, but IMO less interesting than understanding what's really going on.