In my small town they have had an in town 8 ball league for 30 years. Most all of these players have never even seen the inside of a real pool room.
But,
they know when playing the 8 ball bank you play it at pocket speed 'always', period! It not only takes away the hole, so the opponent cannot use that hole, it blocks your opponent's shots to that hole, but it also leaves the 8 ball right there putting pressure on your opponent, and you have an easy shot when the opponent misses.
So, the answer is the player does not know 8 ball if he banks it so hard, he loses the game by double banking it into the wrong hole. The farm boys know that!
Whitey