When I was learning about cavities in dental school, they had us cut specific shapes in fake teeth. We did this over and over, over and over. You are never going to meet a cavity, with that exact shape, but it' prepares you ,gives you some experience.. I think kata has it's purpose, like everything else. Personally I think kata should be practiced regularly, not only as a important part of a martial artists development, but to preserve the past. History is important, and it's preserved in the kata. Karate now is seeing many fancy kicks, spinning this, and jumping hook that. You wouldn't find those in traditional kata. The same way reading a history book, or talking to your grand parents gives you an appreciation of the past, and allows you to grow as an individual,.... Do your kata, and like it .