there seems to be a parallel with the industrial revolution - being fit and having muscles used to be the norm when everyone worked the fields all day. but now that grocery stores and sedentary jobs have made exercise optional. so choosing to pursue fitness signals to others that one is disciplined, takes pride in their appearance, etc.

i can see the next couple generations of AI agents causing the same effect on reading, critical thinking, and intelligence in general. thinking is no longer necessary with AI agents, so maybe cultivating one's ability to think will become optional/personal pursuits which send similar signals.