Kelvis,
Of course, you're 100% correct. In a perfect world, 100% of dealers would handle this flawlessly.
But most folks ARE incompetent.
I've come to expect the room service guy to forget the butter.
I've come to expect cashiers to struggle with simple calculations.
I've come to expect contractors to need to be called back to repair the floor tiles or electrical outlets or whatever they installed.
I've come to expect doctors to need 2-3 swings at diagnosing anything.
I guess I just hate it that the only ones fired the first time they botch something are the poker dealers.