He is proud of the machine that he found, and is proud of solving the mystery of its workings. His ego swells. He is admired by thousands of people. He wins prizes.
Then a few people start asking about the exit he was supposed to find. He avoids the answer. He points to his achievements. A sense of disappointment starts to spread.
The exit of the maze is unification, the machine is string theory. String research is good for your fame and ego. But string theory is useless for unification.