Thats for those that go and run, then come home and forget to either unplug or take out their lipos.

Then, a week later the next time they check, the lipos are either puffed or will not charge because they've pulled the voltage down too far cause the esc kept draining them while they were connected. You're not supposed to allow voltage for a lipo to get below ~3v per cell at anytime, it will damage the cell. Reason I keep my lvc set at 3.2v to have a little safety margin.