It certainly works for many traders who consistently outperform the market by trading stuff like FX and Crypto. TA and trading price action can also be a tool to limit risk.
Btw, selling plans of executives often involve very trivial algorithms, such as "sell when price above VWAP till price reaches <some lower bound> for 30 days or 20.000 shares sold". (Some brokerages will try to create additional liquidity in the meantime, depending on what you want and how much your security is traded).
Correlation doesn't mean causation. Hamsters and octopuses have outperformed hedge funds in experiments. You can outperform the market by throwing a coin to make decisions. TA has zero scientific basis and there are no proofs for any analysis TA people make.
