This post is about PA trading.
My opinion.... this is all visible in hindsight.
After a trade goes wrong, you can always draw another trendline that seems more visible now than before, and blame yourself for not seeing that trouble area before.
This is all subjective trading.
Doing it in realtime is extremely difficult, and a trader will always be one step behind, finding faults for not looking at this or that trendline or S/R or trouble area, or test, or retest, or failure, or BOF, etc etc.
Just my opinion, others may feel that the holy grail has just been discovered. Thats their opinion