Some people really asked about that. Ok.
It doesnt even properly scrobble. Nearly half of my music comes through my badaphone - which is unable to do this simple operation. Significant lack? Like I ever cared about scrobbles.
Lastfm is useless for me, from any point. It doesnt represents me my own attidute to my music. It doesnt represents it to other guys. It's just the number of listened off tracks being systematised by artist. Means nothing. So it just got replaced with something more applicable to my own tasks and purposes - I love to systematise everything, I love music, but lastfm doesnt help in it at all.