How work blunts our abilites

Albert joined his actual company right after college. It's small enterprise, flexible and ever-changing.
Albert has no fixed task. He is encouraged to walk twisted paths, adapt, learn, apply, fail and try again.
Because his brain is continuously challenged within broad confines, he is not constricted by the rigid and extensive rules that usually govern bigger corporations.
Albert accumulated a wealth of knowledge and know-how in a relatively short time, while most people stagnate in a comfortable monotonous routine, going over repetitive tasks.

These same people graze the panic level when the management for whatever reason is forced to conduct various training session for its staff.
We all have this ingrained belief that time spent on a task leads to expertise.
It is not completely false, but it doesn't always reflect reality.

The similar character of our daily tasks gives us a sort of situational confidence that elevates our status within our department. It caresses our ego, and prevents us from venturing into realms where we dont have enough authority to command the same kind of respect and expertice we get in the constrained field of action in which our skills have a great weight. 

This give us a myopic evaluation of our real abilities. Our ego is often the main obstacle to our development.

Time spend with mildly challenging tasks sharpen our abilities, time spend with dull repetitive ones blunts our senses while giving us a false sense of great savviness.