When a playlist completes playing, the playlist automatically (and quickly) starts over again.
I do not think most people want that. Most people would like to have silence after completing a playlist, until they enter more music to be played.
While there is a function (Player>Stop After Current File) that will stop after a track, but it can only be applied when the last track is being played.
If you attempt to apply it to the last track and then begin playing the play list, the function does not work when you reach the last track.
This is a significant issue and I stongly suggest you add the functionality of allowing a "stop playing after last track" function to be embedded in a playlist.