A better phrasing is “Does anyone use technical analysis exclusively?” …and, perhaps, “As a trader or investor?” A select few billionaires have made their fortune through programmatic trading but I suspect the data is not restricted to stock price history.

I suspect the market has the quality of the particle-wave duality. A little Heisenberg’s Uncertainty Principle in play.

Edit: (e.g. once you find a TA method that works exceptionally well, and the market learns of it, it’ll cease to work as well. Hence the teams of developers at all the firms and funds.)