When Jyn Erso’s mom gives her the Kyber Crystal necklace in the beginning of the film, I half expected it to come back as a functional implementation of the plot. I’m so glad they didnt use that schtick. If it were typical to Hollywood, she would have used it to restore the uplink to transmit the plans or take down the shield in some way; complete with a “I had the answer around my neck the entire time” moment.
In the end it was just a memento which is kind of nice.