Because the way things stop and go, stop and go, without any ramping (gradual climb or decent) should be worked on.
0:07
follow through and drag
i think its the camera movement thats your downfall with the replay at 0:05. speeding up the velocity abruptly kinda ruins the clarity of what even happens in the replay
You are wrong.
..all keyframes in that 3 second clip have been edited in the graph editor to be fast slow fast in order to actually sync up with the beat...
It's because you have 0 <- Speed ramping. Is why it doesn't look smooth.