There is no system which works without the trader.
The trader is always the "Holy Grail".
It is all about what the trader does, and what the trader doesn't do in the long run.
Newbies always think that there is some proven way to sit down with the charts, every day, and make money.
That's not how reality works, and mentors can talk-talk-talk as long as they want, but it's the trader who either has what it takes, or doesn't have what it takes.
Here is an interesting YouTuber who explains this very well:
However, how much will the newbie trader implement?
Some manage to get to the Consistency Phase after many years.
And only very few get to the Performance Phase...
