If problems arise in a still image, imagine animation troubles that can arise making a video.
They can be many and also unpredictable.
For this reason, it is very important that in the project calendar there is a time’s slot to solve them.
Some of them, if you are attentive, you will be able to detect animation troubles in initial phases of the problem and their arrangement will be less expensive. You have to think that if something fails in a sequence of 20 seconds, 500 frames are affected, not just one as in the case of still images.