... at the end of the day.
Subtitle feature can download suitable subtitles from put.io (default source is opensubtitles.org) either manually with a list, so user can choose best one, or automatically default one. Downloaded subtitles are moved to the folder which video file is in and also renamed. In this way subtitles are easily integrated to the videos without any extra effort.
There are also some small filters and settings which make your life easier.