i figure it teaches you how to hit one pitch in one place without having to determine ball or strike. is it floating in or out.. is it the right pitch to hit back side or pull. what is the situation asking for. are you telling me that you make the same swing all the time?
i don't see this as golf. the ball isn't stationary and reacting to where a pitch is and what type of swing you have to make doesn't happen on a tee.
Um, it's called move the tee around to simulate different situations for ball placement. It's not designed to be a catch-all problem solver anyway.
Does teach consistency in your batting mechanics, and helps teach memory focus of where you want to make contact.
Only live BP will completely do what you're talking about. I imagine the pitcher throwing the ball so I'm not staring at the ball on the tee, and that helps. Also helps with timing.
You should have one swing. I don't play any upper level, but I would think anybody who watches your at-bats regularly will figure out by your body movement where you're going with the ball. Not giving them that cue would be an advantage IMO.