If you are talking about trading in general, I agree with you that technical analysis is important for everyone who wants to join trading, without it, for me I consider a trader without this basic knowledge as a gambler. However, this basic knowledge or technique is not enough to be a successful trader, to say i what you need, I also agree, but it’s not everything or all what you need.
Nowadays, we have various markets to trade, most of them Forex and crypto, if we take for instance Forex, we can apply technical analysis on every pair to generate money or at least have successful trades. But when it comes to crypto market, we can see a whole different thing and rules, most of the time technical analysis are only for very short term trades or historical levels, support and resistance points sometimes are helpful for traders.
I won’t say this topic isn’t beneficial, personally, I can’t trust anyone’s analysis based on Technical analysis only since fundamental and money management are way more important.