I don't know that the number of times a track is started would have any perceptible impact on an SSD, especially given the small size of the write (much smaller then, eg., a game save). I do think it would be cute to have an old rip of my favorite ambient YouTube mix that has accumulated hundreds of plays, even if that count isn't synced between devices (it'd accumulate them on whichever device I actually played it off of), and that that sort of passive, local scrobbing is worth at least as much enjoyment as a small game save.