Essentially, the goal was to reach a wider audience, so the genre added pop-inspired elements and features commonly associated with R&B ballads.
Smooth jazz began in the 1970s, emerging as a form of crossover jazz designed to have broad commercial appeal. Comparatively speaking, it’s an easy-listening version of jazz, incorporating more predictability and gentleness than you find in many other types of jazz. Essentially, the goal was to reach a wider audience, so the genre added pop-inspired elements and features commonly associated with R&B ballads.