Feature description:
In the progress bar of the now playing screen and mini player there is a bar that moves along with the playback position. I assume this shows the cached part of the song if you stream a song, but for locally stored music this seems to be unnecessary.
Problem solved:
None, it would just be nicer in my opinion.
Brought benefits:
The user would be able to discern whether the played song is stored locally/cached or is currently streaming.
Other application solutions:
Other players, that play locally stored music don’t display this bar.