I agree on the range and timing. I'm not sure about the power. Certainly, if only done all by it self kata will only take you so far. We got to hit things. That's not to say that there isn't some gains to be made by cleaning up sloppy technique while doing kata.
As far as range and timing....they are with an imaginary opponent so they really aren't gonna help you. It's just a prearranged set of moves.