My mother objected to me spending too much time reading and not enough outside.

I imagine there were people in the stone age that objected to people wasting too much time near the fire and not enough fighting with sabertooth tigers.

Exactly that! When I was living on the street, we used to call the fire "stoneage-tv". Because the human brains have such a long history of staring "into" the fire, I have the mild suspicion, that reading on e-ink displays without a backlight might make it less likely to get lost in thoughts, than when staring on a "glowing" screen. Unfortunately the only competetive screens are still rather expensive (paperlike)..

..damn, I got lost in offtopic thoughts again! ; )

It's an interesting thought! If you had a Twitter account in your bio, I would have followed it.

I don't think a parent encouraging their kid to have a little balance in their life is necessarily a bad thing.