Want 4 playlists with start memory? Use four different brands of players/apps. Right now, nobody is going to do what you wish, at least not on phones. Or you can figure out how to retrieve playlists from the cloud - but you would not have start memory control, not just access. Start memory works between linked devices - you start a movie in the kitchen at lunch, you pause/ shut off and pick it up at that spot, in the den - and yes, we have left it things paused, and picked them up instead. But what you ask on a phone - too small a niche that care enough, to make designers do this.