I'll rephrase it as well then:
Notching all your shots takes away the element of instinctive guessing when trying to hit that 1st attempt, which is where the most fun and pride is when you nail that shot 1st time.
Re-aiming with your thumb, your aim could be correct, you just need to get the pwoer right, or even if it just needs slightly adjusted, when you 1st aimed it, it was all instinct and the look of the angle that made you want to shoot, not by counting out the precise location of the cursor pixel by pixel, you were close, so you would change it anyway thumb or no thumb.
Notching takes away the surprise and anticipation for me, when you notch, you expect it to hit, when you guess, you wait and hope for it to hit, and if it does, you feel good because you guessed it.