If you want to watch the videos and have a greater overall understanding of the fights and stuff then go for it, watch the videos and have a better chance of succeeding. I don't believe that people should be penalized for not watching them and that's a general rule of thumb for me.

I never watched any Ultima Ballad videos and managed to do just fine there, same with other dungeons and other primals and stuff. The videos are a tool for personal use to better your overall ability to recognize what is coming in the fight and how to deal with it. If you don't want to use them, so be it.