I was riding to GameCrazy to purchase a copy of Gladius for PS2 ( I just discovered this game and I really enjoy it) and thinking about this thread.  I have not read every single post yet, so if what I am about to say has already been said then kudos to you, buddy.

Anyway, some people draw the blueprints while other people build the project.  You can mentally know how to do something from step one to fin but not have the physical skills to accomplish the task.  That doesn't make you less aware than the person who has both.

You know the famous saying..
"Those who can't do teach and those who can't teach, teach gym."  - Woody Allen