One example of many:
When you go into Bahamut-Stance you get the nice and cool animation, but what if you have a marking on your head at that time?
In Savage you are tied very strict on making damage, you cant delay skills much and sometimes its hard and very close to those "head-markings"...
I know some raiders disabling all animations and set everything on low, but then I ask you: "Where is the fun?"
We are not machines, humans like to have some eye-catchers!