Some Americans never fully embraced face masks, those swaths of fabric that became one of the seminal flash points of the U.S. coronavirus pandemic. But for many across the nation who did, rising vaccination rates and shifting public health advice are forcing a recalibration of a relationship with an accessory that has served as a shield against a deadly pathogen, a security blanket during a crisis, and a symbol — of regard for the common good, liberal politics or belief in science.