> books are fine once you hit 6-7 years old, before then they'll get bored of them after 15-20mn since they can't read comfortably

Teach them to read young, buy books that are active, etc. My kids could read for a lot longer by that age, and so could I.

> in places that aren't adapted for children (e.g. in an airplane or train), a tablet can be a life saver

Talk to them, play games with them....

I loved spending time with my kids, and now they are grown up I am very glad I did.

my kids have a personal music/story player (Yoto portable for those curious, it can be loaded with your own recordings if the cost of the licenced cards is too much).

The big one (5) has a camera, we also play guessing games (like the classic "animal, vegetable, or mineral" but usually specific to their interests such as animal, instrument, etc).

They both like books and will sit with them for upto an hour uninterrupted despite the younger one's inability to read.

After that, a switch, or a heavily curated selection of videos might be available.

I think screens are fine in moderation, almost all parents do it, but it's far from the only option.

> 6-7 years old, before then they'll get bored of them after 15-20mn since they can't read comfortably

You could teach them to read. My mother taught me to read when I was four before I went to school at five.

> in places that aren't adapted for children (e.g. in an airplane or train), a tablet can be a life saver. you keep them busy/playing for an hour or so, then give them their digital crack for an hour, rinse and repeat. audio books are a good compromise

Boredom is not fatal and in small doses is a good thing for creativity. Children survived and thrived perfectly well on long train journeys for a hundred and fifty years before digital crack.