I often multi-select tracks to copy or move to another playlist. In prior version, the tracks stayed selected so I could do more actions on the same tracks. Now, after copying to another playlist, the selection goes away, forcing me to reselect. This makes a common operation of selecting non-adjacent tracks USELESS.
Another complaint is that everything is moving to being sized for touch with huge spaces between tracks. Why are you assuming that everyone uses tablets?? Where you could easily see 20 tracks on a single screen before, now it's limited to about 10.