The ability to pay attention on a specific thing for more than a few seconds doesn't feel "natural" to me. Evolution does not favor long-term attention for anyone who is not a top-predator. Imagine a deer paying too much attention to grass It's eating and not able to be distracted by the slightest of the noise a predator may make is not going to reproduce. We, humans, are close to top-predators, so, maybe! I've not thought about it too deeply. But I still feel that the ability to focus for a long time is a bug, not a feature in the natural environment. The economic system has turned into a must-have feature and lack of it a bug that is to be cured by medicine. I wonder if early pioneers (not the sciency/nerdy kind) all had ADHD?