At the end of each season, the National Hockey League awards the Frank J. Selke Trophy to "the forward who best excels in the defensive aspects of the game, as selected by the Professional Hockey Writers' Association," per NHL Public Relations. The Selke Trophy is awarded for regular-season performance.
Today's advanced stats have added many more prisms through which we can assess defensive performance, but league-leading Corsi percentages or SAT metrics, as the NHL prefers, don't necessarily guarantee a shot at the hardware.
Most of the hockey writers who vote for these awards are longtime veterans whose hockey experiences stretch back to well before the fancy-stats era.