With MIDI, the take lanes can get pretty bottled up with overlaps and weird clip lengths. I believe that is by the nature of how midi clips can be edited. The old "rebuild layers" command was pretty convient for fixing that mess. I'd be happy to see a "rebuild" kind of function that would distribute overlapping clips to separate lanes and also eliminate empty lanes. I guess that is saying that lanes are good for things other than "takes".
 
Another thing about empty lanes: If a lane had just one clip on it and that clip is deleted or moved or bounced to another lane, the lane becomes empty. But I have to see the whole time line before I am sure the lane can be deleted. An event clip count, or even an empty/not empty indicator in the lane header would be helpful. Or rebuild take lanes.
 
Bill B