Posture

Why is modern day posture so poor? My theory; because now our environments are too flat, and also we spend too much time in cramped indoor spaces, which prevents our neck from extending, jutting out, and looking into the distance.

Everyone always says that modern day posture is so poor because of us being on the phone all the time. I don’t think this is necessarily true. Maybe also the problem is we spend too much time sitting and sedentary?