Well, the real issue here is that these are people working in the financial industry and surviving in New York. 90% of retail traders lose 90% of their accounts in 90 days, so unless any wizard here is experienced enough to be in that 10% and has been trading profitably for years, the TA's are doing something right.
It's not like fundamental analysis is much better by default. The best prediction of a good trader is to have a history as a profitable trader.
Look at any of the books by Van Tharp, he's a psychologist who studies traders and then writes books about how to trade like them. The argument of TA vs. FA vs. coin flipping doesn't matter if you lose money.
Plus, these days investment is completely different as a beast than it was back then. You have these automated trading platforms where you give them your money and they take care of everything investing in things that usually you'd need millions to even participate in properly. Masterworks(blue-chip art piece stocks, basically), Fundrise(big real estate), Swell investing(hipster tech companies), the first two are likely to outperform an index fund and definitely an unskilled trader(swell doesn't count since it's a grabbag that you can allocate yourself and that could go anywhere).
If I made a fortune in the cryptoboom I would have switched to investing in something like the above. There's no point trying to outperform ~10% in this unstable economy, even the greatest consistent trader of all time based on historical data only managed 50% a year.
I think it's fine if you want to roleplay goldman sachs employees, but the truth is that the vast majority will never perform at a goldman sachs level.