Because every market is different. Some markets are used to hedge, and some are more the domain of directionally based decisions.
So TA in "any form" can not be used with any consistency, whether it "works" or not. As the underlying calculations are based on different meanings although its a "physical" number. Its more to do with what the number represents.
Numbers in the future are determined by a lot more than numbers in the past, more to do with time and opportunity, but thats another thread
Yes, I have rephrased that part, hopefully that will make the point better. Sorry but that was written at 2 in the morning.
Anyhow, despite that , numbers are numbers and the analysis should be based n that ( ie. maths) to keep it the calculations OBJECTIVE. That is my point.