‘Get it right in the end’ argue that is necessary to draw learners attention to their errors to focus on certain linguistic (vocabulary or grammar) point.
For example :
S1 : Is George is in living room?
T : You said ‘Is’ two times dear, listen to you- you said ‘Is George is in?’ look on the board. ‘ Is George in the’ and then you say the name of the room.
S1 : Is George in the living room?
T : yeah
S1 : I win!