This effectively doubles the time resolution (also called "temporal resolution") as compared to non-interlaced footage (for frame rates equal to field rates).
The main function of a line doubler is to take an interlaced video source which consists of a two-field frame and create a progressive scan (single non-interlaced frame) output.
The industry quickly abandoned this practice, and for the rest of the decade all monitors included the assurance that their stated resolutions were non-interlaced.
Benefits of reverse telecine include high-quality non-interlaced display on compatible display devices and the elimination of redundant data for compression purposes.
