You're free to not like the story, but just because you play the game doesn't mean you're entitled to have every piece of content given to you. Neo ExDeath and God Kefka are rewards for raiders who are able to beat the previous 4 fights in their respective tier. If you want to do that content, then just learn your class and the fights and do it. It doesn't take as much time as you seem to think. Even if all the time you have is a lockout or 2 a week, it's still possible to do.

Also, while you're right in saying that a small percentage of the playerbase tries Ultimate fights, the percentage of the playerbase that tries savage fights isn't as small as you seem to think. Plenty of people can at least do o5-6s. In SB, they've made the first 2 fights of the tier very accessible for people to get into savage if they haven't done it before, so more people try it out than before. If you want to see the high-tier fights, then progress through the lower-tier fights like everyone else did.