'proper TA' rarely works lol. otherwise experts like Al Brooks would have made millions.
problem is everyone is trying to look for some free lunch... alpha beta gamma theta butterfly iron condor etc etc... while the big dinner feast is right in front of you and people are too blind to see it.
Do you have an example of TA failing at least one time ?
Here's one example on the CAC 40 Index (weekly chart) but trade management is key for that failed breakout (small profit, breakeven or big loss)...
Yet, if you look closely at the price action on the entire chart. There are other breakouts that would have produce big profits, small profits, breakeven, small losses or big losses depending upon the trade management.