The fact that people have been concerned about this for generations doesn’t automatically nullify the point. Attention and focus are skills which children must develop through boredom and long-form focus. TikTok brain is making that harder and harder for children to learn.
It may be hypocritical, but have you considered that all of these forms of entertainment are unhealthy? The only difference is that they get more and more efficient with each generation, causing increasing levels of concern from each generation. That’s indicative of a rising trend