been flying the plane for 10 years and stopped looking at the vdev a long time ago, haven't found it relevant unless complying with an altitude constraint. still altitude times 3 is the best, if vertical speed is less than half your ground speed you need either drag or speed. if no atc speed, expedite mode works wonders if available, if speed approaching vmo to fast a little touch of speed brake raises the elevators immediately to keep the speed in check.
if not complying with constraints, relevant track miles to touch down is what counts, frequently the don't match the flight plan sequence. this way the speed brake can rest and passengers are happy.