I think that's provably untrue based on the fact Saturday morning cartoons were massively popular as a curated content feed on TVs through the 70s, 80s, and 90s. Kids (including me at the time) loved them and sank many hours into watching them. They were wholly approved by my parents, to the point where sometimes my parents would watch with me. Unless kids have fundamentally changed (which seems unlikely) the differentiating factor is almost certainly that kids simply now have access to far more unsuitable content.

Well, one part of a proper education of a child is to teach them that life isn't about gratification. Neil Postman made this point already in Amusing Ourselves to Death. By educating kids with Sesame street you didn't teach them to love education, you taught them to love television.

When you make learning synonymous with fun people start to believe that if they aren't having fun they aren't learning. Which accounts I think for something that a lot of teachers at all levels have observed, kids are increasingly unable to learn if there's no immediate reward.

Video games from the 90s were actually pleasant as a kid, and I'm happy to see my kids enjoying them today rather than the slot machines that the industry makes for kids these days…

(Unfortunately I'm well aware that it won't last long, because social pressure is impossible to fight at individual scale)