They are not garbage but if you will solely based on them in making a judgement, that would not make you successful.
You have to consider the hype, FOMO, and the FUD in the market, you won't see that in chart/s but you need to read some news and speculation in order to judge it well. Remember, graph is just one factor needed to read the movement, it's not the main factor.
Without using the chart, and only depend on the hype, FOMO, and the FUD, he cannot analyze too because he needs to analyze the movements from the chart. So it will have a connection between chart, hype, FOMO, and the FUD so you can analyze better than other traders, and that means, you will have a chance to make a profit.
Crypto charts are not garbage as long as you can use it with the right. You will have a sign or guide to predict where the price will move in the next hours. But you need to have the knowledge to analyze the chart so you will get the other clue besides using the hype, FOMO, and the FUD, and perhaps, you will have a good prediction about the price and the next movements of the coin.