Commotion set a high standard for a rotoscoping application, introducing rotosplines and offering features like motion tracking and motion blurring for masks.
With progressive scan there is no necessity in intentional blurring (sometimes referred to as anti-aliasing) of video to reduce interline twitter and eye strain.
Conversely, interpolation (which avoids judder and may create more fluid motion than in the original video) can instead cause blurring, particularly visible on fast scrolling text.