Here is another example of my belief of that it is the person and not the system.
I'll use something that alot of people do.....drive. A car is made up of sub systems, one of those being the brakes.
I'll use me and me wife as examples. She been driving 35+ plus years and me 40+ years. I'll use our 02 Mustang GT as the car.
Here is where its the driver (player) and not the car( system) comes into play.
I can use the brakes in ways she isn't even aware of. I can use the brakes to rotate a car during cornerng. Rotating a car is not the same as turning a car.
I can be hauling ass into a corner and wait and wait and wait before I brake because I know what the limits of the brakes are. She is clueless about late braking and how to do it.
I can brake equally well using either of my feet. Since the car is a auto, I left brake all the time. Being able to left brake makes more a smooth application of the brakes when cornering. In some turns, I can use my left foot to brake and slow down and never lift the throttle.
In some, I can brake, lift the gas, at the apex, get back on the gas before I start to release the brakes.
No way at this time, the wife can do this. Same car, long time drive and yet I can get more out of the same car than she can.
Now, as another example, daughters boyfriend got a 02 Mustang GT Manual. He talked me into driving it one day. This was the day I introduced him the what his car could really do.
There is a nice twisty road nearby and that is where I headed. Once we got to the twisty parts, I put my foot into it. After about the third turn, He utter "Damn, I didn't know my car could do this!!!!!!" The more he laughed, the faster I went.
A few turns, I gave showed him the concept of Heel/Toe driving and how this gets you into and out of turn fast.
Same car, different drivers, one making the car do things the other can not.
Maybe it is my racing motorcycles and the Skip Barber Racing School that played a part in my driving skills. Maybe it is seeing how one racer goes faster than another on the same type of bike. OR maybe seeing a known fast guy take a bike and lay down lap times faster then the owner of the bike.
Same bike, one rider goes faster than another.
These are just a sample examples that illustrate human performance plays a outcome of the results of what we do.
For example, in pool, its not the system (car) it is the player (driver).