Thanks for an excellent video!
Relating this to pool- great players develop superior skills- then, through sheer volume of play, encounter every situation that could expose their weaknesses, take the time to recognize and admit their weaknesses to themselves, and work tirelessly to remove those weak points form their game. This is where great coaching/teaching can either shorten the path to expertise or, at a minimum, point the way on the path to becoming great at something.
As per the stock market- it is entirely driven by people who look to capitalize on the emotions of fear and/ or greed - that is the exact reason why no one can actually predict it's path in the short term ( ten years or less) - however; inevitably ( over one's lifetime) the market always goes up- hence the case for long term index investing - in the short term the market is a gamble- no matter how anyone tries to persuade you otherwise.
Case in point- in January of 2022 NOT ONE so called stock market expert predicted a 22% loss in the S&P for that year- no one knew the market's resultant reaction or could predict the FED's frenzied raising of interest rates as it did in 2022!!