Hyoho
2nd Black Belt
maybe from the koryu view, you are correct, kata does not change. but from my view when talking about karate it does and should. karate kata is often an incomplete and misunderstood Chinese form. the principals and concepts are often bastardized versions of the Chinese equivalent. so they are inherently flawed. over the decades ones understanding deepens and that may cause different timings and target points. changes may be subtle or dramatic but they do happen. i believe that after decades of study you make the kata your own.
What you say is not strictly true about koryu or waza. One could say that no two situations would ever be the same from a distance, position, timing etc. For this reason we have henka. We can do a particular waza with a specific variation. But that waza must still contain the fundamentals of a school. My school "always" does henka for public exibition/demonstrations. I do not allowed students to show the original as it still "mongai fushutsu". Not the be taught outside the gate. That's why we have the kata (the breakdown) To set in stone the fundamentals and possibly rearrage them. It's still X Ryu doing X Ryu. Not X Ryu making it up so that it's no longer X Ryu.
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