There are plenty of poor/unsuccessful traders who trade based solely on TA, and lots of youtubers who make money teaching those poor souls TA lol.I barely knew what a stock was 5 years ago. I've got 1 year of regular daytrading. But even aside from me there are plenty of people who trade based solely on TA. On top of that, what do you think the Quants that write the algos base their signals on? Seasonal trends and fundamentals? Whereas fundamentals are most certainly used, such as the economic calendar days, support/ resistance are a regular signal among others.
Most quant strategies are some form of stats arb, momentum, or market making. Sure, some use moving averages (smart ones use kalman filtering) -- but that quant dev is not analyzing a chart pattern, he/she is studying a vast set of data, and the "TA" component is an add on based upon what works for their analysis.
That is not the same as some dude trying to time ES intraday with a mouse click lol.